Malicious PDF — malware analysis report

Static analysis result for SHA-256 781753f1b87566f6…

MALICIOUS

PDF

37.1 KB Created: 2020-09-01 07:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3331a47a212cce93a5c0a1b69d6ef39a SHA-1: 4d6c4dd57b46681b6b1d3c89c6ec55d2d7538fe1 SHA-256: 781753f1b87566f6cd4450c7da2b1474d389db18749fb5daceb96ad7912a8f4c
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to other PDFs, likely to manipulate search engine results or obscure the true destination. The document body contains a URL that is also present in the heuristics, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=free+ethiopian+music++sites
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/921909_54d1541ef9fc4accabf5a30622a144a7.pdf
    • https://static.usrfiles.com/ugd/a382ee_50c49f523bf745789e15147763315bfd.pdf
    • https://static.usrfiles.com/ugd/50de67_6264d4cf51c140fe81d99fca3f186e53.pdf
    • https://static.usrfiles.com/ugd/516793_ac4f40c60abf4b629c174d358242490a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2346/files/todapuzerexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/deborah_harkness_times_convert.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7655/files/vebogumafuvu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/vokivugikamixegavoba.pdf
    • https://cdn.shopify.com/s/files/1/0460/3546/8452/files/8286232437.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/wow_classic_tank_warrior_bis.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/fewudokugisef.pdf
    • https://static.usrfiles.com/ugd/b8c837_00f73f7febfc4a128f414edf49ae0f10.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b3e9e6523146d191ab8bd65508d732.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_off0000472f.bin
0b53599c9952c38bdc75b6c23c572542597dbcb77cf096cc3407ca67dd3c1362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x472F 4980 bytes
font_01_sfnt_off000057e5.bin
d24b631c572b03e0ee8b4dba772064b361d86e54e389181d918b04d0bd4718d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E5 9856 bytes
font_02_sfnt_off00007991.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7991 4324 bytes

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