Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4677efec1e2753…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 23:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9bc59b6ba79de0e2287a284d025321 SHA-1: dfe3432226d553ada2dde4563d0dcf559327c368 SHA-256: 7e4677efec1e27534ab3753cb069a1c0c1ad72f5bcf60a8035da3e65c900380b
194 Risk Score

Malware Insights

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

The PDF contains a lure promising a free amendment, which is a common advance-fee scam tactic. It embeds numerous links, with one pointing to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=amend+pdf+file+for+free`. The ML classifier strongly flagged this PDF as malicious, supporting the advance-fee scam heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=amend+pdf+file+for+free
    • http://files.kellysurette.com/uploads/1/3/0/9/130969592/dedom.pdf
    • http://files.ambercove27waterfalls.com/uploads/1/3/2/6/132681993/jesepivexeno.pdf
    • http://files.wvquilters.org/uploads/1/3/1/4/131438840/8708365.pdf
    • http://files.thepigmentgroup.com/uploads/1/3/0/7/130738943/numinetepu.pdf
    • http://pilamud.simplyamazingskincare.com/uploads/1/3/2/6/132682883/wafopadulezuloz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/abstract_nouns_worksheet_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/guild_2_renaissance_mods.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/54009423713.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/sepaxanobadedumuboraxup.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/welikutukalobiwivilofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33647917740.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/koxezukixoviwowovogemife.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/54696599416.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/programa_amadeus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/xipibufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/dajoxuvobi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/69394333182.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/69429377578.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_off00006df2.bin
f443c6249aa66da9c36825c596ab6fff536ed4eab3dedec4796c196c261d2bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF2 4788 bytes
font_01_sfnt_off00007e23.bin
26e9ae630b2f3d01dc38b96c37ab2202870661ad9718f798ca54a22ec4e5d292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E23 10284 bytes

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