Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc86adfb3a072e0…

MALICIOUS

PDF

38.8 KB Created: 2020-08-09 04:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12ae8085073690e8609085ab9c7a0c20 SHA-1: 43a7eb27a4ca7ce9431701adda6081729d8746ba SHA-256: 6dc86adfb3a072e08716c702f048123ef980808f26b29bc59681776653d0d789
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme to lure users to malicious sites.

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=multiplying+polynomials+worksheet+coloring+activity+pdf
    • http://files.rampcheckglobal.com/uploads/1/3/0/7/130739450/2092493.pdf
    • http://files.hmingrong.com/uploads/1/3/0/7/130738894/sisanerobusanaseke.pdf
    • http://files.rcmcm.com/uploads/1/3/1/4/131452838/mijijadupiviropu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/websites_without_https.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/lerokanodisorigus.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/personality_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/26991884770.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/16760718821.pdf
    • https://cdn.shopify.com/s/files/1/0435/3435/2548/files/24306509911.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/pisuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zumofuza.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/vixawijatokamizowekobagil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/rafubevikuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/the_fall_camus_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/pumawizagebubipuzaluxefo.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_off00004a1a.bin
0c1d1281d29890775ba2f77d3f0a58b99fe663cb5c83d68384ed4822aebaa2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1A 5776 bytes
font_01_sfnt_off00005daf.bin
857f3c62d4198b5a1d4a0e98e1e5196e72d8fce9851857b3f745b4d842ac824c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAF 9928 bytes
font_02_sfnt_off00007fc8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC8 4324 bytes

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