Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d29606de369392…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19df6386cc3743cd8f6cb27867a8bc4e SHA-1: 21253eaf138460dd6398f3d431ec8dfd84bc3a31 SHA-256: 17d29606de369392fd8ea75c96eb92caba6f51d84bdb2b55aea03218a06f0fb4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at ttraff.ru, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains keywords related to educational worksheets, likely a lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to 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/wb?keyword=ordering%20fractions%20worksheets%205th%20grade
    • http://files.eabindia.org/uploads/1/3/1/3/131383456/bde18d25a600b18.pdf
    • http://files.greetersinternational.com/uploads/1/3/0/8/130874683/6395482.pdf
    • http://files.joyinparenting.com/uploads/1/3/1/3/131381881/sesowatodaba.pdf
    • http://zamopamo.graybiel-lab.com/uploads/1/3/0/9/130969082/tivolofurawi.pdf
    • http://pufuruxef.jerkconference.com/uploads/1/3/2/6/132696323/2669525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/kugivinawixitiwokuwax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/rivanomonarev.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/pixuniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/nemosewuxozajuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/8905645697.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/tail_command_in_unix.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/tnpsc_current_affairs_in_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/zipeberifumet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/moburerinisetogolevitalok.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/37891173500.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/votofoke.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006078.bin
c0efc13eb4f4be118ed03aad4a160c3481cb99ae67271e99f23e1e01e669fda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 5556 bytes
font_01_sfnt_off0000737d.bin
67eaa4e6341490c8d1f701acbc2e041a23ce25bf951db84d1504f8093f8dc0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 9928 bytes

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