Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d87674511cbefb…

MALICIOUS

PDF

43.7 KB Created: 2020-08-12 05:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde18482ea909380c83fc82b36cf4476 SHA-1: 6282650dafa6a2f55c43b7bd0a6dec6ef8a01e1b SHA-256: 55d87674511cbefb5c2992b9f878cc5b3550e08a9fd728c6030671b497049435
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=drip+irrigation+system+project+pdf'. Another critical heuristic indicates this PDF is part of a link farm, likely to improve search engine ranking for malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify-hosted PDFs, suggesting a lure to download further malicious content or engage in phishing. 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.ru/pify?keyword=drip+irrigation+system+project+pdf
    • http://files.bencole.info/uploads/1/3/2/6/132695418/wawitupan-lupujikujazalap.pdf
    • http://files.elizabethstahlpsychotherapy.com/uploads/1/3/1/1/131164176/tuxexulerotegolimob.pdf
    • http://niwip.rapturebibletruth.com/uploads/1/3/1/6/131606349/08de7ae356764.pdf
    • http://files.zazaboocosmetics.com/uploads/1/3/1/3/131379246/movopu_dawururekaweve_zotosule_tokeruvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/fajujufovojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/60368270564.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/mujilefanabikemibazedubib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/73556929743.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/identifying_alliteration_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/58396834676.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/87659718364.pdf
    • https://cdn.shopify.com/s/files/1/0431/2730/8454/files/zawojipimemuwujak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0431/2252/4326/files/53535945343.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7350/files/suxigowizoseg.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/ruziwijofitugefaputuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a93.bin
2ab875f52a1f1a54859bacc5a92582718d02c0a050a7f7930b12953b281da4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 5620 bytes
font_01_sfnt_off00007da5.bin
e57fde7e8e995e929262aa5ae5f74ac84bc164834bfe5d48275486dfc35d4239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 10496 bytes

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