Malicious PDF — malware analysis report

Static analysis result for SHA-256 05abacd9e82b20a1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f1711f6beb50fbe05947c53e5b075af SHA-1: 2550fb4ddfacf23368dc70c24b394d64a0a16337 SHA-256: 05abacd9e82b20a1c4e95c7b0b200d1cbb2cfe9e58f04fa028408ea4cb94c5fc
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious or known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of malicious intent, possibly for SEO spam or to distribute further malware. The ML classifier also strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=mike+williams+chargers+injury+report
    • http://files.yuanzi-economics.com/uploads/1/3/1/3/131380754/fenofugutot_disez_damexisiwi.pdf
    • http://rutalar.personalsafetyandpistoltraining.com/uploads/1/3/1/3/131379874/7409013.pdf
    • http://files.songalonglifesmarathon.com/uploads/1/3/0/7/130739037/kibazasujona.pdf
    • http://files.ryancmoss.com/uploads/1/3/1/3/131381614/364636b.pdf
    • http://files.argonsizzle.com/uploads/1/3/0/7/130738748/votuvavawobamimas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/southern_africa_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/gufunitefojuzisuloz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/pilojijigeke.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/pikafuxulavafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/treatment_of_hepatitis_c_virus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0840/9250/files/dragonscale_leatherworking_guide_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/34422087616.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/3612796105.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/50266954268.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/lofifu.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_off00005bf3.bin
6c97df66b933d0489c2f1343592a21a7a5372c21715ca6cb6904ac13a3437cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF3 5684 bytes
font_01_sfnt_off00006f47.bin
f761be4c3cab46c2374abf1a229c09e3e865b1dd56ab87a8fc78c89aea75e82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 11384 bytes

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