Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd14281dfdc8d9d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-11 03:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fe8d51a57eea107b62b31a1778202b0 SHA-1: 1c22669a3bd9568dddddc1ef6dc8662e6cfd715d SHA-256: 3bd14281dfdc8d9da7f56fc6f46d596d2ab254605c883f0e6066389c3f4821ce
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'free printable calendar'. The primary malicious URL identified is https://ttraff.cc/pify?keyword=free+printable+calendar+august+2020+pdf, which likely leads to further malicious content. The presence of a large number of external PDF links also points to a link farm strategy.

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=free+printable+calendar+august+2020+pdf
    • http://wuzod.davidwanderart.com/uploads/1/3/1/0/131070722/06c87414f6db0.pdf
    • http://files.middletownnjhistory.org/uploads/1/3/1/4/131452811/xotisadivuri-fimeg-vexeruvaje-lofanajukeded.pdf
    • http://files.oswegoeastmusic.org/uploads/1/3/0/9/130970003/mitadexamofubut_dabisewavotozis_rivowopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4096/files/55306893127.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/oceans_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/30342107282.pdf
    • https://cdn.shopify.com/s/files/1/0450/7166/3256/files/transport_vocabulary_esl.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/bevizoreku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/caisson_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/49674737276.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/85299032891.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/rogobijugawolilukuwivul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/judupikizupejum.pdf
    • https://cdn.shopify.com/s/files/1/0434/6796/4580/files/wuluxefevudizinobekal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/sketch_license_key.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_off00006455.bin
d7b16a3bfbbb0b7b003faee70c622725cb96236e768ba8aaa45b1e8695e68521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6455 5464 bytes
font_01_sfnt_off000076e8.bin
da81933648641efa40dbd1f93eda32527437cc47e8cff72ad054ee67d27eb137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E8 10080 bytes
font_02_sfnt_off0000996a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x996A 4324 bytes

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