Malicious PDF — malware analysis report

Static analysis result for SHA-256 7411465bfd8613e8…

MALICIOUS

PDF

45.7 KB Created: 2020-08-08 15:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65eb5ed88042fb3443ef2af79fe3837c SHA-1: 6fc6f1b636e0e2874273442ff5cb5d0c4f1cb7d3 SHA-256: 7411465bfd8613e84c6dfcd1ca79cbbc5926daf2c035324b35bae3753649100f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=pdf+file+merger+software+free`. This link is presented within the document body, suggesting a social engineering lure to trick users into downloading potentially malicious content. The presence of numerous external PDF links further indicates a link farm strategy, likely to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=pdf+file+merger+software+free
    • http://files.mthebronmusic.org/uploads/1/3/0/7/130739312/05c06c.pdf
    • http://fapadol.mirasbigday.com/uploads/1/3/1/4/131407995/5187c77eb.pdf
    • http://fulipomab.theprincesscryaries.com/uploads/1/3/0/7/130738531/vuzud.pdf
    • http://files.quintessence-abq.com/uploads/1/3/2/3/132303359/nujomefax.pdf
    • http://files.missinginamericaproductions.net/uploads/1/3/1/8/131856050/1924251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/jaguxabekorigub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/factors_affecting_tardiness_of_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/39282107746.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/zinowegeriperibore.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/68610964067.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/wejulewizawamuwewibadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/pukid.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/19576843295.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/sofemojijevurere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3528/6943/files/96_nissan_maxima.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/apc_smart_ups_3000_manual.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_off0000743a.bin
294775e8a83f4a0b255e6ac4b5fbfa13982c1dd70e06c778d8a9f36baaeae7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 5320 bytes
font_01_sfnt_off0000864c.bin
d51e7137e89c57f76d1568cea8d6a2e04436b4c0b73d71601486ee4468f4124d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864C 10332 bytes

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