Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac7347ead2c1539…

MALICIOUS

PDF

39.9 KB Created: 2020-09-09 01:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23456f94d10d6cdfa8577286d136b085 SHA-1: 2d4a56ec503231a1a359597b8da0088be9d702c7 SHA-256: 7ac7347ead2c15397c7b0b6bf9c45b81b696194f7ffc6a8bfd8055897b7e7983
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to potentially harmful content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the presence of a link farm suggests a broader campaign to distribute malicious content. The ML classifier also strongly indicates maliciousness.

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.link/wix?keyword=assistive+touch+untuk+android+apkpure
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/717a42_613a7cce697f4860ad34856cf05c36f2.pdf
    • https://static.usrfiles.com/ugd/03a576_1e82cc888ace4d7ca6c1c0e5d20b52c4.pdf
    • https://static.usrfiles.com/ugd/6116da_9046c1f03b224687b1672c05cfc5e72a.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_ecabaf4e7a9846cbb1f64c9968e605c8.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6981/files/sawupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4338/files/asmaul_husna_with_malayalam_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/rowodalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/toxicity_of_vitamin_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/cristianismo_descomplicado_augustus_nicodemus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/sisituw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/the_birdcage_cast.pdf
    • https://cdn.shopify.com/s/files/1/0459/7311/0951/files/appendicitis_sonography_report.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004909.bin
3a438db8f981ca5bd3e7e89fc08775b3afd3084d642da9c21a7979d90010e27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4909 5240 bytes
font_01_sfnt_off00005add.bin
fe7df07173375bdd2aed19a0231521299e9fe44b1a889c601dc0100487dec723
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 9980 bytes
font_02_sfnt_off00007d3c.bin
9f650169421b0b7087dd31af68adb40091046a2bb8e16b0442b6a694d872da2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 16204 bytes