Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcafde4a0f7de4…

MALICIOUS

PDF

33.5 KB Created: 2020-08-09 02:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4aaf4e31b23d29c1d9d46906fad391 SHA-1: 496b2988ef4e32dd8ef6a82171fd609fd1cb682b SHA-256: 91bcafde4a0f7de45cadc4a79ceaef4a209ce9432c4bf35c5250b4f7574434f8
152 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=bticino+living+light+pdf'. The presence of numerous links to external PDF files hosted on Shopify suggests a potential SEO manipulation or link farm tactic, possibly to distribute malicious content or improve search rankings for undesirable sites. 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=bticino+living+light+pdf
    • http://files.mrsmccschooldays.com/uploads/1/3/1/8/131871424/guvinajavipi.pdf
    • http://files.draiochtshoppe.com/uploads/1/3/2/7/132740214/luxosawaxivogi-depiviku-faxazuwoba-fajewoxej.pdf
    • http://files.projectrunlove.com/uploads/1/3/1/6/131606260/74b44.pdf
    • http://files.silverfernflag.org/uploads/1/3/0/8/130813755/mivonesalo-sojuxe-kibegiwalato.pdf
    • http://pikelil.henleygreyproducts.com/uploads/1/3/1/3/131383377/jepeson.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/advanced_computer_architecture_kai_hwang_naresh_jotwani.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/minecraft_giant_oak_tree.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6924/files/wiluvupovus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/jakovekatujed.pdf
    • https://cdn.shopify.com/s/files/1/0452/4271/2221/files/amines_mcqs_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/base64_to_converter_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/texibejir.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/76875065727.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/81128678946.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/97112638093.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/19276905720.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_off000046f8.bin
73f0dfb57f988c04d127ffdff35620b8c6a7e89ceccbb73b12ab2e743f7a6cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F8 5044 bytes
font_01_sfnt_off00005834.bin
0d43a68df0a41f78a23c808a3a459cdbe2aa89e08cb7f11ce03f1d2fc441701a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5834 9692 bytes

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