Malicious PDF — malware analysis report

Static analysis result for SHA-256 6040c37c3a8b0cc6…

MALICIOUS

PDF

40.1 KB Created: 2020-10-02 23:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4c7e58983375bfbe3702371c3fb9f924 SHA-1: 6644b1d52b118996b35d6bc9507479bf7e2e3066 SHA-256: 6040c37c3a8b0cc6f2406c25b9abbc9a087b7840c71c80b0c592394c1783855e
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 domains. The heuristic firings indicate a PDF link farm and malicious redirector usage, suggesting the document is designed to drive traffic to potentially harmful sites. The presence of the URL 'https://gettraff.ru/strik?keyword=fractions+worksheet+year+6+tes' and other similar PDF links indicates a likely SEO poisoning or link farm attack pattern.

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://gettraff.ru/strik?keyword=fractions+worksheet+year+6+tes In PDF document text
    • http://files.georgeshawconstruction.com/uploads/1/3/0/8/130874328/35033890bff8fe.pdfIn PDF document text
    • http://files.pickupmypearls.com/uploads/1/3/2/7/132740536/wekuxigamelowogexor.pdfIn PDF document text
    • http://files.boloker.com/uploads/1/3/0/8/130873718/lolugibevigas_wabikapezafasa_datogitotene_kolujibadosutik.pdfIn PDF document text
    • http://wikixuzaw.clarendonoutpost.com/uploads/1/3/1/4/131407080/6735798.pdfIn PDF document text
    • http://natimem.warriorheartedmom.org/uploads/1/3/1/4/131412955/7ba04675fce2c.pdfIn PDF document text
    • http://files.toysinjesusname.org/uploads/1/3/1/4/131437919/ec014d65.pdfIn PDF document text
    • http://jopodew.dulcineaquartet.com/uploads/1/3/1/4/131408071/31561b339bcad.pdfIn PDF document text
    • http://wopal.acupunctureandnaturopathicclinic.com/uploads/1/3/1/4/131437693/35e9ddbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/211f3986-0de3-47ce-9a2f-7122a5a0b90f/16952247763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacda6e3-d16f-42a6-99cc-932377ba82bb/gamefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4023a343-2788-4068-94c7-66f606a0cd7f/fezopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/lujilozibabowiragojuvif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3761/7059/files/98521249040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6015/2488/files/57204661436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8424/3363/files/cry_like_a_man_quotes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB5 5220 bytes
SHA-256: e8723bf3dcab09ab0148e8cac2008890b43c28cab1e4571afad13fe8e555f035
font_01_sfnt_off00007190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7190 10000 bytes
SHA-256: 2e28ef568a422ca49728373ce7a707e09f70af709198d5a0a1ff37ea7245c95f

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