Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b67b42b4712785…

MALICIOUS

PDF

53.1 KB Created: 2020-09-09 21:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: dae75a9f160e87432c793000abc0b285 SHA-1: 256bfc9eb19a7bd4feb072d2fee87c3d6538c552 SHA-256: 74b67b42b47127852d12b57002fe35b2c68e9a934bf198aa7e6bb38126beb3cf
194 Risk Score

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.me/wix?keyword=butterknife+android+studio+tutorial In PDF document text
    • http://files.thebinarylivingway.com/uploads/1/3/0/7/130776015/lijusegof.pdfIn PDF document text
    • http://files.wesleytbrown.com/uploads/1/3/1/4/131438274/lapifi_wirajozo_xikalagada.pdfIn PDF document text
    • http://files.hdloolbox.com/uploads/1/3/1/6/131637841/9950b1cb.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/1/0430/0665/6666/files/fukopura.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e0d0cf_d42581b002e745e89ca6590f8d3a25f3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a7074a_d7f4470bb2db4eaf94a530513f519d06.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/guruxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/mlsbd_apk_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/70181408878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/mipopuzude.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A0 5012 bytes
SHA-256: e1633b6ae8654f7496170753c880316d8f77d106146f1a7659d062cec59640c9
font_01_sfnt_off000096bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BF 15592 bytes
SHA-256: 083219782383e15aa3b0bc6322e4b7685db11ececd84b1ee4c35aeabd74ed331