Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e882ae8cd0d6edb…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 07:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da6c730c3697d621fc595c12469de90 SHA-1: 8697b4df17a48b96823ca2911e620ec94170f4a5 SHA-256: 6e882ae8cd0d6edbb0b2f6131e743c3a587104e711aaad78a4d98becfb10f8f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also 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.cc/wix?keyword=cvs+near+upenn
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/tadolugenugegalumelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/where_is_utorrent_installed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/tafavebafasugozedepusiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/revowedalojetikesep.pdf
    • https://cdn.shopify.com/s/files/1/0437/2270/2999/files/58715275588.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/86870233073.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/kopikenavopetefum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/bank_management_system_project_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7147/files/dipif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/xisuxofabum.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/suwinupexuzifibuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/61530580280.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_off00005379.bin
4903b140d5a414caf38f8cc3ef902f2d852bbee9bc51584270ef7b6e9ed27a20
pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 4508 bytes
font_01_sfnt_off000062c5.bin
dbad3c0212a09fc76b5bb1ca46e3e14a1e331f8757c7d14b3afd261d9986ab10
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 10604 bytes
font_02_sfnt_off00008709.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8709 4324 bytes