Malicious PDF — malware analysis report

Static analysis result for SHA-256 86acdec5bbfcfa26…

MALICIOUS

PDF

57.6 KB Created: 2020-08-23 02:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1f093d6891ea1f88a98f0931667d930 SHA-1: dc954771a302245a0161134c9838fbed51e368e6 SHA-256: 86acdec5bbfcfa26085ef1520573cd13692e4b25e486cfdcf9ac322f8ecfadc2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. The primary malicious URL is https://ttraff.cc/pify?keyword=ota+tv+guide+austin+tx, which likely serves as a lure to a malicious payload. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=ota+tv+guide+austin+tx
    • http://gexure.naturaincognita.com/uploads/1/3/1/4/131482975/9397fd53e8720b0.pdf
    • http://files.jacksonvilleartistsguild.org/uploads/1/3/0/8/130813108/3553427.pdf
    • http://zubavi.goldorchestra.org/uploads/1/3/0/7/130739625/niwiguwat.pdf
    • http://files.poseidonbrewingco.com/uploads/1/3/1/3/131380687/434ed9.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/65109788014.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/organelas_celulares_e_suas_funes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/it_s_going_down_for_real.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/elmer_s_wood_glue_msds_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/30043394949.pdf
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/1578265646.pdf
    • https://cdn.shopify.com/s/files/1/0435/1583/8628/files/abstract_reasoning_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/business_ethics_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/vibosafovujuvakogoxug.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/aditya_birla_sun_life_mutual_fund_redemption_form.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_off0000a342.bin
c0cd34d3a034bd4b52ee630d59e7b2d049b91370d36587513ab895ddbae1280f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA342 5020 bytes
font_01_sfnt_off0000b475.bin
e34575f86b29f53a4000595160e6ea2b8c360b0856c91b0f9e93c0dad18f039f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 10408 bytes