Malicious PDF — malware analysis report

Static analysis result for SHA-256 721945f4dd41e983…

MALICIOUS

PDF

34.0 KB Created: 2020-08-20 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a94aa79e4fb33fc498b5b7e17f0f400f SHA-1: 1348902980e09adf809d819d1128b385a5414e74 SHA-256: 721945f4dd41e983019add832646a30577552ef9b7f36a8ca52d073f5e21df2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to lure users to malicious infrastructure, likely for phishing or malware distribution.

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=d%2526+d+beyond+wizard+guide
    • http://biwema.richwayspirits.com/uploads/1/3/1/1/131164250/26441822f.pdf
    • http://files.godsgracehawaii.com/uploads/1/3/0/8/130815228/9920326.pdf
    • http://files.autismhomebase.com/uploads/1/3/0/7/130739052/f2ea4d375f3.pdf
    • http://xusotu.vanpickuppr.com/uploads/1/3/2/6/132682565/sowekeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/5164016370.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/lofegugegedumixujuzedo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/42144354281.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/22305830070.pdf
    • https://cdn.shopify.com/s/files/1/0434/3850/6146/files/adobe_after_effects_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/29880525659.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/bisedopuriduwodubijixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/72539499150.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/29687149336.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6471/files/spoken_english_malayalam_file_download.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_off00004afa.bin
491d847b6606b2aeef656f0a947dbdea29e01eb243e8a29fdb65c017b6eb5ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFA 4156 bytes
font_01_sfnt_off00005928.bin
bd62278c8288927f1c3a2954990ddcdd45713b67e4625e621899ba7d12846065
pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 10208 bytes