Malicious PDF — malware analysis report

Static analysis result for SHA-256 4488fab5dd11601b…

MALICIOUS

PDF

38.3 KB Created: 2020-08-24 19:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db167f2e65449f40437574c2cad6d298 SHA-1: 5a510ff2a49cd87de1acbad08bf47253d94c20af SHA-256: 4488fab5dd11601b09f138522fa2afd2670466df4e918142d6004df9a7ba98f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body text, though garbled, includes keywords related to a garage door opener manual, suggesting a lure to trick users into clicking the malicious link. The primary malicious IOC is the redirector URL which is designed to lead users to further malicious content.

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.ru/pify?keyword=chamberlain+garage+door+opener+remote+953cd+manual
    • http://nobunabuv.radioquetal.org/uploads/1/3/2/8/132814930/jomagozofiwuj.pdf
    • http://pakir.kjohanssonstudios.com/uploads/1/3/0/9/130969742/9507745.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/27603791633.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/89510170708.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/vusazogiderudagikotezug.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5384/files/jovepemag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9380/3679/files/nj_road_test_tips.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7974/files/ansys_17_cfx_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/17627708635.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/tiwonatexoluxitubameluli.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_off00005582.bin
1936a8fa53b58136e413de85eb01bd14b05094c25b5f1d183496def4d11abe2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5582 5800 bytes
font_01_sfnt_off00006912.bin
81446572e4ce1f009d85104e19f8f682dc70d8354e401c1a3a99723943f44ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6912 10308 bytes

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