Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86a41ff0bff47e6…

MALICIOUS

PDF

55.3 KB Created: 2020-08-06 06:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f03e97adcf027f389134d8c0069e33 SHA-1: ffb60c086f7067a3f77676f9717486e35d356ef2 SHA-256: e86a41ff0bff47e6bae87f8573bbaeb5291cbedde2370761312cc99e47de0964
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for downloading books, which is a common tactic for distributing malware. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=ba+1st+year+books+pdf+download
    • http://files.leadpyramidpublishing.com/uploads/1/3/1/0/131070469/b18ede3.pdf
    • http://files.vitalvisionstraining.com/uploads/1/3/1/4/131437276/bb5c59583ec66.pdf
    • http://files.jacobsearslibrary.org/uploads/1/3/2/3/132302924/9321265.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/32916561949.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/mikewupevijupibo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/95101216032.pdf
    • https://cdn.shopify.com/s/files/1/0430/4827/2023/files/7436600269.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/miragela.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/bedroom_design_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/gejinufiliwonukanabur.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/41270827564.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/weed_eater_push_mowers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/useful_russian_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/zemuwap.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/
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/useful_russian_

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602f.bin
c2fa02d9886921b149fe8e9bea7195e3d0bd5c75efc761d832eb42fa6a5c3e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5272 bytes
font_01_sfnt_off00007240.bin
82c047ac093810968bc043e1395e19a776fddf61b5ae473d26a3e46c73460b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 2596 bytes
font_02_sfnt_off00007dc3.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 2320 bytes
font_03_sfnt_off00008816.bin
151d62a6800b20264b3a7e246b6a99f0a493920cb286efd8dd31be9df0202cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8816 10208 bytes
font_04_sfnt_off0000ab3c.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3C 16224 bytes
font_05_sfnt_off0000c089.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 4324 bytes

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