Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5324379abd0197d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 01:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce744b45f78ce30e6b904a52e0e2bef9 SHA-1: ee43439ecc796ee15dc89dbef7c3afb4911813b4 SHA-256: c5324379abd0197d967a076d561a9741dd803cd9cf31d8e34a60750662adf9ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results and direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=4+digit+subtraction+without+regrouping+worksheets+pdf
    • http://files.foosie.store/uploads/1/3/0/9/130969654/sokusudekagajuxinimo.pdf
    • http://files.neverweatherband.com/uploads/1/3/1/6/131606901/696534.pdf
    • http://kifusab.the76erfiles.com/uploads/1/3/1/6/131606617/tipuvaxejotodev.pdf
    • http://files.weddingdanceworldwide.com/uploads/1/3/0/8/130873895/fuzosuxewadufi.pdf
    • http://lasovo.harmonizeyourhealth.info/uploads/1/3/2/6/132696323/35a062b4bd69ce.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/70676787975.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/pikima.pdf
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/fimofuvuxozetuzizoziz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/16206114013.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/61005779899.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/adobe_cs5._5_master_collection.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0956/files/3d_max_design_tutorials.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_off00005abb.bin
c789c4a7f086be5550cfb8cdb791983f157bd4685a0e555a980b651bdc74b305
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABB 5676 bytes
font_01_sfnt_off00006e15.bin
0e9aa3217458d6f001fe92fe5896f5eb1bc8ae2755dedd31a367b800ac4bc35f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 9960 bytes