Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5f514e453a886a…

MALICIOUS

PDF

38.7 KB Created: 2020-08-08 23:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285ce6ccf36d0b0c4b35a8944f05c59a SHA-1: 523d6085992431195b08b8b0bdb4688e4ebd811d SHA-256: 1a5f514e453a886afab65e0f49a73f23135b375515dc0d39e21757b4faa402df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify-hosted PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=biotecnologia+ambiental+libro+pdf'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

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.cc/pify?keyword=biotecnologia+ambiental+libro+pdf
    • http://files.desertskydoodles.com/uploads/1/3/1/3/131379168/399083.pdf
    • http://files.elsalvadorsurfcamps.com/uploads/1/3/1/0/131070572/9657626.pdf
    • http://files.almondburys.co.uk/uploads/1/3/1/4/131406780/3981059.pdf
    • http://files.gsypicframers.com/uploads/1/3/0/7/130740257/26c5079afd2.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/rajefufekiruxidazadoxovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0770/files/4130674897.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/vasufojijelezamujo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/budaya_menurut_para_ahli.pdf
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/social_media_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/nazotakurepepajaviwexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/24600040948.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/85574238985.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/gepufasilefojalakudub.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/ffxiv_dps_meter_2019.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/velebananofer.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004869.bin
905b2d6a0ce5535e5422267eb993bfe05d3701200eba03789acb14e7c0fe0227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4869 5276 bytes
font_01_sfnt_off00005a2e.bin
1d932de42c0c9f2da3067100334ee1a3e1f801ffe59a497ea773e6c8dce808c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 11096 bytes
font_02_sfnt_off00007e7a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7A 4324 bytes

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