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)
MD5: b6e814bfe9c54f4222949f55fb527fc1 SHA-1: 6296ccaf8b88146dd116e1983a32e22c19c07692 SHA-256: 6ecf99b0b84caea6879bb5ebf006bee64ef07dc5126ef67700e61f3c87f2271a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a "rational exponent worksheet doc", likely a lure to encourage clicks on the malicious link. The presence of a link farm and a critical heuristic firing for malicious redirector links strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.shootingstarbotanicals.org/uploads/1/3/0/8/130873855/9478650.pdf
    • http://kifafoja.rebeccarankinyoga.com/uploads/1/3/0/8/130873995/0187ef21.pdf
    • http://podepide.bodysmartutah.com/uploads/1/3/1/4/131437987/4434806.pdf
    • http://files.glasserpreschool.com/uploads/1/3/0/7/130775729/bixakizib_rilelube_wapila_moxogisa.pdf
    • http://files.iohmf.co.uk/uploads/1/3/0/7/130739510/xisazoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/59968404095.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0441/0349/9928/files/7329384177.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/9481654664.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/17802968226.pdf
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/mifizilexujofij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/31646847799.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/27399750946.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/4243463548.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/kodojemug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/ardex_cd_fine.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7101/files/50277973766.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/bn__giao_thng_h_ni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/kuvifipeg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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