Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36ea9dd8eb8703d…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 17:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1569219e2ad9346464bce882ebe41010 SHA-1: ac0697eab9dfc48b6664c9c7cc04331e9061da67 SHA-256: f36ea9dd8eb8703d4cd5ed848262c91473e468aada66aa7f89046d492db0d469
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure for free PDF downloads. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=best+books+online+free+pdf
    • http://files.b7landscaping.com/uploads/1/3/1/6/131637021/xanilagu.pdf
    • http://files.davidcopher.com/uploads/1/3/1/4/131406149/3af1b600f848.pdf
    • http://files.holytrinitywytheville.org/uploads/1/3/0/7/130740563/wuliva_woboxefine_zenetudidawoti.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/benefits_of_livestock_farming.pdf
    • https://cdn.shopify.com/s/files/1/0431/0650/0769/files/jewokinogoxamimiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/4229/9295/files/alopecia_androgentica.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/96922629272.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/xuwezanediti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6665/files/oba_rowland_lifestyle.pdf
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/cat_cable_types.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/sepunufizosabe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/nojubefalakemijoduxat.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/56117381131.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/lukodal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/36658424336.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/14114551707.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_off00005403.bin
351c02d317856e4aafa9a30b7d1cb3043f4e596ac21957ef3e4124f44abdf7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5403 4868 bytes
font_01_sfnt_off0000648f.bin
a2bc9b698b650fb8e14083e2dd2cb78dab218b4edb92b589a30866c5d2b88cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648F 9476 bytes
font_02_sfnt_off000084f2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 4324 bytes

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