Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f4a0e82b21d0f6…

MALICIOUS

PDF

44.9 KB Created: 2020-08-28 04:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90fdc6ef781b7cfb8b2f7e9a5afd3411 SHA-1: 1dcff6131f27eef9ddc94267ce334bc366c01721 SHA-256: 74f4a0e82b21d0f6b2921fab7ca8f40a1b1cf0718d332a997eee795f10322994
154 Risk Score

Malware Insights

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

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 URLs that are likely part of a link farm designed to lure victims to malicious sites, potentially for phishing or malware downloads.

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.link/pify?keyword=suero+dextrosa+al+50
    • http://files.drsmobiletherapy.com/uploads/1/3/2/6/132682142/3616d8.pdf
    • http://files.doggiedoodles.net/uploads/1/3/0/8/130873826/vanurad.pdf
    • http://files.thestudentphysicaltherapist.com/uploads/1/3/1/3/131379183/peranigukevewepiteba.pdf
    • http://files.patgreenwellartist.com/uploads/1/3/1/4/131412858/e1ea927d65.pdf
    • http://files.brownwoodlyrictheatre.com/uploads/1/3/1/4/131437341/de4a6c965aef1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/19992373712.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/40805701120.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/46488592368.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/senuluketisaxikax.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/gulikevufajovedawakik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4436/2647/files/33269065582.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/zokow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/automobile_engineering_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6330/files/getixejufejilogivefimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/cctv_camera_installation_guide_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/xopisidowoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/xizeborewagipibibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/cervical_facet_joint_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006273.bin
05305589b609241e3ca4a460869c824f8bdda6225f2e39e2d00260388430efba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 4984 bytes
font_01_sfnt_off00007375.bin
054ad0ed058c5e819960a8eb0debcee61e30c7d2c40af33f9ec6a26ad96edab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7375 11404 bytes
font_02_sfnt_off00009799.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9799 4324 bytes

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