Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c6378ac8b1840a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac82cdabfb543284dd32731ff566bcd4 SHA-1: 895571f9fea40b3391bb5736a838915c148fab8f SHA-256: 61c6378ac8b1840a9e550b1cbe9e923aec4fefcc544e4faf111f83948ed3d593
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are algorithmically generated and point to external PDF files, suggesting a link farm or SEO poisoning tactic. A critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=dailygreatness+business+planner+pdf, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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=dailygreatness+business+planner+pdf
    • http://files.clothdiaperproject.com/uploads/1/3/2/6/132695428/2874484.pdf
    • http://files.azamericansaddlebredfoundation.org/uploads/1/3/2/7/132740978/a8662fb3208d.pdf
    • http://files.yoanstudio.com/uploads/1/3/0/7/130775286/3777489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/35065959841.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/90063656297.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/broadcom_802._11_ac_network_adapter.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/58919593284.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/65584406887.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/kewiramo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/94445134413.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/loxaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/webomobituwisumepepaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/35555786110.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/72200823497.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/nesusedafolufuko.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_off0000652f.bin
ae7fc2f2acc7caaaf61550a09c438294863df33291a1a79402fe49e219401028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652F 5452 bytes
font_01_sfnt_off000077d1.bin
b6096fcdb82668507d00e5765c2b33c79a44e85cbf95dd7e61985de7f4fc7abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D1 10268 bytes

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