Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa72658a476dc3c0…

MALICIOUS

PDF

50.9 KB Created: 2020-08-10 00:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ca7075bd4f999693c28338fddd72e3 SHA-1: 8397ee608616055754294894c12e1f0c6c21c43b SHA-256: fa72658a476dc3c0b73ae4f74528029931e9f53852d95605e42503054789e0f2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign links.

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=bioreactor+design+and+operation+pdf
    • http://files.assv4u.com/uploads/1/3/1/3/131379591/8524758.pdf
    • http://files.mdesignslincoln.com/uploads/1/3/2/6/132681579/7871057.pdf
    • http://files.mtllabfsu.com/uploads/1/3/1/8/131856039/88227c7.pdf
    • http://raguxat.salmonriverwoodworks.com/uploads/1/3/2/7/132740214/zibimam.pdf
    • http://vonimonuv.compassengut.com/uploads/1/3/0/7/130739590/8cc11277f0.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/fomimerunuwaxamif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6899/files/skyrim_intro_copypasta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/xiriwijosukigokumosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/60367289096.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/zafogazugenuwuresemavuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/pugupulidevifefid.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/my_guitar_shop_database_exercises_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/agronomy_kharif_crops.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/accounting_ratios_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/6261105242.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007afc.bin
abba5a7e251a0a0071f3b6f25bc42610559b1216f654234020fa9854276e8240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFC 5128 bytes
font_01_sfnt_off00008c77.bin
f3724d35595b810027b06b9f7c5092537f42f9ccf090fbde99716060a18c0cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 10632 bytes
font_02_sfnt_off0000b0cc.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.