Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe03dd4f2f5cd6c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 00:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89c534a74fa420a05076cb95fa823fb SHA-1: 60bb5529f4a384223280b4405b2250b7570c952b SHA-256: 8fe03dd4f2f5cd6c51f25783896c01ff102ce440136c1d859d95261821c724d2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate documents, but the primary URL redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and numerous other URLs pointing to Shopify, likely as a camouflage technique. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for linking to redirectors and hosting a link farm.

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.ru/pify?keyword=chemistry+equation+sheet+pdf
    • http://files.onairadvocate.com/uploads/1/3/1/8/131871745/fovoj_wisuresave.pdf
    • http://fodobesa.jameshuntermusic.com/uploads/1/3/1/4/131407005/bixot_timamim.pdf
    • http://files.groundstonefarm.com/uploads/1/3/2/6/132696112/360407.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/41266726711.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/12681181068.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/13824210852.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/madibirolom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2346/5628/files/kemapigej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/mofukip.pdf
    • https://cdn.shopify.com/s/files/1/0436/9576/7706/files/symbolic_violence_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/3794/8061/files/happy_birthday_in_tagalog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/c_reverse_string.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/23438796491.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/wepijiguzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1294/0188/files/82266389217.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/nedifuxedebewikasibuwolex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/dasimitakilopane.pdf
    • https://cdn.shopify.com/s/files/1/0428/8210/5511/files/dipamikokikasada.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa0.bin
eef43301e1c5fe19182a6ddfbc99b951ce77c03e64965b9576e09ed1bd400aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 5380 bytes
font_01_sfnt_off00007cc2.bin
d04b031cfdfe8398864b8143e02315ab23e5c57d1a5fd93d10dbc5f56ddf6cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC2 10720 bytes

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