Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa66e1178fbad6e9…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 15:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8746ed2dcf200ba8711f75bf3d07ede SHA-1: d90f1639085577f41edc2c6307f0ff9968aa5457 SHA-256: fa66e1178fbad6e914b16950b540dc2fddd0a82ce325a01e3f668d69f33b7cf7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, disguised as a document about lower back pain rehabilitation exercises. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the redirection to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS classifier also flagged the file with high confidence. The embedded URL points to a redirector that likely serves as a lure for further malicious activity.

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=lower+back+pain+rehabilitation+exercises+pdf
    • http://files.robertleebaptistchurch.org/uploads/1/3/2/6/132695596/nabininomuteforixe.pdf
    • http://files.snowsbendfarm.com/uploads/1/3/1/4/131407138/rosutatesomot.pdf
    • http://files.zoevanmourik.com/uploads/1/3/1/3/131379761/nonewaxodufupiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/38023362419.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/xalusarireno.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/93697518975.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/22281452897.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/nafujarijufiguner.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/70376710403.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/merezovibujuwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/kulubuguru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/72839333780.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/6032326216.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1567/files/85317509594.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/67367764362.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/jugaxana.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f1.bin
f048d017314ba752231f964eb4759b1f11841d4a78ba3f3254d5dd47326a74f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 5336 bytes
font_01_sfnt_off00007c1d.bin
73a517264a4cf71f5d659e0cde43508995e5877759e09acfb0535d20db14549e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 9700 bytes
font_02_sfnt_off00009d51.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D51 4324 bytes

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