Malicious PDF — malware analysis report

Static analysis result for SHA-256 5442f9fe6924a664…

MALICIOUS

PDF

45.8 KB Created: 2020-08-10 10:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc63405524c9bcb179dbcdb1b4139cbf SHA-1: 6817d1894445c96f404d371dc0f26038a444ad21 SHA-256: 5442f9fe6924a664697b5076a0113b83ac2b7e77e7126768a960176ee4c35fe2
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at 'ttraff.cc'. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=birle%25C5%259Fmi%25C5%259F+milletler+antla%25C5%259Fmas%25C4%25B1+pdf', suggesting a lure to download further content. The ML classifier strongly supports the malicious nature of this PDF.

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=birle%25C5%259Fmi%25C5%259F+milletler+antla%25C5%259Fmas%25C4%25B1+pdf
    • http://files.thinkingcongregations.com/uploads/1/3/0/7/130740563/bineza.pdf
    • http://files.allstarscomedyentertainment.com/uploads/1/3/0/7/130740391/gujiwewugip-riwanixivoli-xezebito-vaxegokasinaze.pdf
    • http://files.liverkids.com/uploads/1/3/1/6/131636766/mituderitir.pdf
    • http://files.canineconciergeservices.com/uploads/1/3/0/8/130873715/kimifesozosepe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/papasujid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13336488851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/3435441583.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/vojolalozitexanifovifik.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/53824884534.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/77754721404.pdf
    • https://cdn.shopify.com/s/files/1/0443/0639/9388/files/learn_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/jeliwolovupuguwenijow.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/biology_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/csi_miami_season_10_episode_19.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_off0000668d.bin
83783da8d1a714e2d94b468d0f4bae18b778f0a05d0a59c9db3d54fe84ccd81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668D 3144 bytes
font_01_sfnt_off000071c0.bin
d45ecc63ffa2423ad7f46e4a378d465b0611cf98f92fe26496b0619857aa34f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5516 bytes
font_02_sfnt_off000083ea.bin
d915d95688ab2dd38ec4ce78b371b1898056ddb591d87f86befe69e979870da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 11560 bytes

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