Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab2b9af61803eb8…

MALICIOUS

PDF

38.9 KB Created: 2020-08-05 01:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fbfe299f9647612c5bc2cf1321d1346 SHA-1: 6240842a7478512cfdfbfc02b78eb4baa3628800 SHA-256: 7ab2b9af61803eb8ff9a83a742d97fa718e8714c14d979148d55b3b2b637ae59
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One of these links, https://ttraff.ru/pify?keyword=sherlock+holmes+arthur+conan+doyle+pdf+download, is known to redirect to malicious infrastructure. The document's content and structure are consistent with a lure to download further content, potentially malicious.

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.ru/pify?keyword=sherlock+holmes+arthur+conan+doyle+pdf+download
    • http://files.christianmeditationrookies.com/uploads/1/3/1/8/131859993/jixopop.pdf
    • http://files.gearupu.com/uploads/1/3/0/7/130776661/noxekezisoxofogogo.pdf
    • http://files.artreflex.com/uploads/1/3/1/3/131398025/f2d6db3c9b59a.pdf
    • http://files.199boxingwrestling.com/uploads/1/3/0/7/130738993/xodikako_baduvuleg_petexoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/88071793431.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/trumpet_classical_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/52624549930.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/26681996183.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/65530303208.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/rikofavojubomeni.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/87926538149.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/51330522546.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000572f.bin
768c19deebecd378888be0419bc11d1edee33e0331d641f02dd55c4b991a3ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x572F 5756 bytes
font_01_sfnt_off00006ab8.bin
a07064a8284ff67e3a19266f747e399550ffc68a043f663ebfa39c31d47414a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 10612 bytes