Malicious PDF — malware analysis report

Static analysis result for SHA-256 6881f741fededdd4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-23 14:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4292710bdaaf9e00e2b00d865b98902e SHA-1: 4274e0c719c0577a4fb60fdd31b67018a3d141d1 SHA-256: 6881f741fededdd46153d511adb4ecce351742565c31a33e244631828c7cbc45
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Android messages apk teardown' and a URL that aligns with this theme. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content.

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.com/pify?keyword=android+messages+apk+teardown
    • http://zizut.morelli-engrg.com/uploads/1/3/1/4/131406071/gilujemadalazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1768/9498/files/95410124118.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/14311708912.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/aminoacido_fenilalanina.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/mikav.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/vajafik.pdf
    • https://cdn.shopify.com/s/files/1/0434/9352/3618/files/toss_up_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/paxul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/babaxilopopet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/pazotijojenisevovisoxele.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/tedifuxa.pdf
    • https://cdn.shopify.com/s/files/1/0461/7450/3065/files/piwiwibafatiwatodozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/78198098288.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_off00005f9f.bin
5591224d07ad70537fd822bbe7d57890a27cbabc8e2505e312c61da140054407
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 5392 bytes
font_01_sfnt_off000071ec.bin
7cfa54e6f1bda5ca1e49b487a23bca99e06fcbe551180c972a6931ccce122402
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EC 10004 bytes