Malicious PDF — malware analysis report

Static analysis result for SHA-256 855bfa33b3d37b13…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 02:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed66de82fb93eb83d5b7d0fe166f4fec SHA-1: 5adfdde8ecbb6c99b7574228b15deddabe25410e SHA-256: 855bfa33b3d37b13239d51a6655edf0434291f40d84d36d473a676dc5370c66c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination and potentially deliver a payload. The document body, though heavily obfuscated, contains the same malicious URL and also lists numerous other URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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=batman+arkham+knight+official+guide+pdf
    • http://files.darvanadoulaservices.com/uploads/1/3/0/7/130775959/godujabu-gowesor-rizofokezopa.pdf
    • http://jopoloro.walkonthewyoside.com/uploads/1/3/1/3/131380005/pajuzuvatevux-lukelomazisu-kabukiziv.pdf
    • http://files.ipac-vancouver.ca/uploads/1/3/0/7/130775490/kibivil_rotubetogexejem.pdf
    • http://files.microneedles2016.org/uploads/1/3/0/7/130739628/2835596.pdf
    • http://files.marshallbob.com/uploads/1/3/2/7/132741352/143339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/51825897690.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/arbaciin_af_somali.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/algebra_2_glencoe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/paradise_lost_book_1_invocation.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/dynamics_hibbeler_13th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/55430331746.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/google_chrome_for_mac_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/eclipse_oxygen_64_bit_exe_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/64738424733.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/lozewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3696/6055/files/62984056357.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/tevatunivekidibubis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ea.bin
cf867dc970e9ff135a314e4d18eb766356ac093c08d065e04be3cc7302e7e2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 5388 bytes
font_01_sfnt_off00009403.bin
c33be6827b25cc8dab0294ddf73e564587bf51dcf2cde855f75bec4c39ddcd41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9403 9864 bytes
font_02_sfnt_off0000b5d4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 4324 bytes

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