Malicious PDF — malware analysis report

Static analysis result for SHA-256 978087194b5b3050…

MALICIOUS

PDF

43.1 KB Created: 2020-10-16 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d6847622b1e286d1b200cd961c2ae77a SHA-1: b1f75ef32cb66c2b087c9a64653163e238231b7b SHA-256: 978087194b5b305005110f0c3c2465ee592d9450032afe29ea934c9eb9425e74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL similar to the one identified as a malicious redirector, suggesting the primary purpose is to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=series+online+8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8765fa9a10d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f879a38f030f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f880bf802452.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/454c3812bf78.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/zodidew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/android_programming_myanmar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a354caf2-711a-468f-b2f7-efc7e6567097/korikarafarivojamuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28544dd3-2f50-4d9f-b843-545039e6893a/lilaxuxodel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba2109d-9794-4271-999e-de9a0c199bf8/giwusalukur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159b9511-642e-4d5d-9c10-bccfa135e561/80917872050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5633/2437/files/america_pathways_to_the_present_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/7382/4678/files/67475353291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28ac2d1-b8bd-41cc-aabc-afd22f43afa9/xolefadodav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0ed881-ff32-4bac-bee1-da653fdb225b/ruwiselowazil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97476a6b-5b7f-4ec3-8112-4a2e3bdd8cdb/73942759533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732aab04-2c54-4ad1-9ab0-c6a16dd273d7/84677137710.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_off00006b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 4768 bytes
SHA-256: 2e98dabc154677addbc98dc30298d798d83d8ce78720bec3917783a0f37786e7
font_01_sfnt_off00007bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD3 10360 bytes
SHA-256: ffd352350c143c863d81d77ebf938d2ba5ae87223d0246de0a9ff7b5021723c9

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