Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf99b0b84caea6…

MALICIOUS

PDF

58.9 KB Created: 2020-08-13 01:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b6e814bfe9c54f4222949f55fb527fc1 SHA-1: 6296ccaf8b88146dd116e1983a32e22c19c07692 SHA-256: 6ecf99b0b84caea6879bb5ebf006bee64ef07dc5126ef67700e61f3c87f2271a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a worksheet document. This redirector likely leads to further malicious content or phishing pages. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=rational%20exponent%20worksheet%20doc In PDF document text
    • http://files.shootingstarbotanicals.org/uploads/1/3/0/8/130873855/9478650.pdfIn PDF document text
    • http://kifafoja.rebeccarankinyoga.com/uploads/1/3/0/8/130873995/0187ef21.pdfIn PDF document text
    • http://podepide.bodysmartutah.com/uploads/1/3/1/4/131437987/4434806.pdfIn PDF document text
    • http://files.glasserpreschool.com/uploads/1/3/0/7/130775729/bixakizib_rilelube_wapila_moxogisa.pdfIn PDF document text
    • http://files.iohmf.co.uk/uploads/1/3/0/7/130739510/xisazoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/59968404095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0349/9928/files/7329384177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/9481654664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/17802968226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/mifizilexujofij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/31646847799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/27399750946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/4243463548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/kodojemug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/ardex_cd_fine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9726/7101/files/50277973766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/bn__giao_thng_h_ni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/kuvifipeg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E30 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off0000a82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA82A 5392 bytes
SHA-256: d0a62a0362b7d6517f1d6c0419c8da59e8636e03ae9c2a782dcd1b14494242de
font_02_sfnt_off0000ba89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 9868 bytes
SHA-256: 1b59ba8d748f7f380e7d81555cea08313e5268eb36a17e0a18dddc0bc351c990