Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc772bb725252f57…

MALICIOUS

PDF

42.4 KB Created: 2020-08-01 06:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e65c1e1df4ae9961ac3296b8b4df238 SHA-1: eb769fb03c778c3afb819a075df383d95f6164c3 SHA-256: bc772bb725252f579a3ce3d218006810af713fcb1adfd193bd584be58c0ef8da
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=dvlottery.+gov.+state%252F+esc', which is designed to lure users with a fake government lottery lure. The ML classifier also strongly flagged this PDF as malicious. 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=dvlottery.+gov.+state%252F+esc
    • http://files.carrieradzevicius.com/uploads/1/3/2/7/132740270/7a35d14d6d.pdf
    • http://files.lundecomputerconsulting.com/uploads/1/3/1/3/131398473/bd6726dfca86b9.pdf
    • http://files.esace.com/uploads/1/3/0/7/130775033/vokelofodux.pdf
    • http://files.dalearrangements.com/uploads/1/3/1/0/131070476/tisimavanaguz.pdf
    • http://files.dramallamaranch.com/uploads/1/3/1/3/131381722/sebejiwovereto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/81722193049.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/21280383683.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/jixasiditotugaxutuvojid.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/5360662183.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/jazusuvedomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/kobexirepuwexak.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/minecraft_pe_0._14._1_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/tofuvevobipor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/papixusisijipe.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_off00005b92.bin
171c3e207d6d9278bd0511ef56875ae5c8c1454428b120018fb66590cabbcc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B92 4832 bytes
font_01_sfnt_off00006c34.bin
9eeaba3c789077ab5046e362152c5d3a364617063d57d58f2bb9a8b7c9ca5f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 10080 bytes
font_02_sfnt_off00008ec0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC0 4324 bytes

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