Malicious PDF — malware analysis report

Static analysis result for SHA-256 6170605bb092f1f8…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 16:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53045bf12684e8f28527c769df4092d SHA-1: 812dcc7eb2bcfed0aff9db188b93fed6a8dd424b SHA-256: 6170605bb092f1f85caa7216958dab5f9240e62939117500e3c633a332ef9b2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector infrastructure, indicating an attempt to lead the user to malicious content. 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/wix?keyword=split+excel+rows+into+separate+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/db93e9_99e37965b3cc44968b40b3e46ed91d78.pdf
    • https://static.usrfiles.com/ugd/f523c3_05913f59f00a4f368984fbaae922e70b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/48f461_32ce87b4a4a54832b9ea1adb5b5c72ee.pdf
    • https://static.usrfiles.com/ugd/3bf302_da00e49d9c674b86908fcda9db12e407.pdf
    • https://static.usrfiles.com/ugd/f3cb45_8d816106fc8d4cddbc6a5eb2f06e0668.pdf
    • https://static.usrfiles.com/ugd/921909_74b9a9ef64c24417ad7134476b0d7e22.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1a8d8fb428a40da929200404155cdd1.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/eating_habits_of_animals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0389/files/nemavonivazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5833/1799/files/types_of_verbs_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/simple_present_tense_exercise_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/45784005180.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/33019894927.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/22720869644.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3419/files/35437406789.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_off00005e3e.bin
c7da0dd23413ee7155bb7fa1e07cdd4ba1d0d411653bfc52578be0411427bf71
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 5284 bytes
font_01_sfnt_off00007046.bin
60e13e12209764c854ed3646abec33519f034b161c2d3f8d75bbaff18d8ba5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 10620 bytes