Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f4baeffaef3bab…

MALICIOUS

PDF

43.1 KB Created: 2020-09-13 19:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceac59c896d31029bb9b89e6a87339c8 SHA-1: 3e64d3922119b56a4c9dfe6b7c263bc24d318fe3 SHA-256: a0f4baeffaef3bab3660d0d70d658c47af797c4d76549a9304ca9c61df6f0987
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, disguised with a search query related to educational worksheets. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify domains. The primary malicious intent appears to be redirecting the user to the ttraff.me URL, which likely hosts a further malicious payload or phishing page.

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.me/wix?keyword=even+and+odd+functions+worksheet+with+answers
    • http://files.sabrinashandbags.com/uploads/1/3/1/6/131637953/rexat-biterop.pdf
    • http://files.katherinemarieprice.com/uploads/1/3/2/8/132814906/7888902.pdf
    • http://files.ottawarotarycalendar.com/uploads/1/3/0/9/130969879/lulakefotekasin-xupusuwusaji.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/finding_perimeter_and_area_of_rectangles_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0435/3890/7288/files/eu4_brandenburg_guide_1._27.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/resuduzadekap.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/agradecimiento_en_ingles_formal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/rutedafanopox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/easy_piano_sheet_music_do_re_mi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1170/files/75664188332.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/20047260606.pdf
    • https://static.usrfiles.com/ugd/271e65_88c291d7c44d4e5fb61b0d7d3859bfea.pdf
    • https://static.usrfiles.com/ugd/370b54_f36bd111a4764a66a6ac1d0c0f4225b7.pdf
    • https://static.usrfiles.com/ugd/2c7c49_f9651a78d4274c1e96043895a243ab61.pdf
    • https://static.usrfiles.com/ugd/891219_40b91f6b4a404c5681adc91769cbbcb5.pdf
    • https://static.usrfiles.com/ugd/c068f8_70a364680a36421c882cca9f65cc88f1.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a08.bin
622070d9c5cd98fe400efb28ab21ca6dd2eb74445d4d7025da97d0c2aca3ad71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 5252 bytes
font_01_sfnt_off00007bff.bin
31bed45a10160635b432e0adcd75d506c831f0cb7856405cbc71532504eb90ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFF 10584 bytes

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