Malicious PDF — malware analysis report

Static analysis result for SHA-256 8400404ba14b62ea…

MALICIOUS

PDF

76.2 KB Created: 2020-07-26 17:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd519d4ffc46cf5b1ea81dafeb717b1b SHA-1: a0f93d3c091a2f033e58ad2454adb2fa69ffc9b6 SHA-256: 8400404ba14b62ea2774a9d803a6f4a3d21afa96853696a76ae262336c113491
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of malicious intent.

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.com/pify?keyword=atlantica+online+mobile
    • http://files.just-verandas.com/uploads/1/3/1/3/131379045/xobuxisedujus_wekabod.pdf
    • http://files.navajoareacoa.com/uploads/1/3/2/6/132695492/3917370.pdf
    • http://files.rpmbusinesssolutions.com/uploads/1/3/1/4/131454521/6088477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/34423605666.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibamiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/83541334075.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/lajemenivimisufijufezom.pdf
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/29392428474.pdf
    • https://cdn.shopify.com/s/files/1/0439/5371/7406/files/muvetigitifawarafijiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8290/6789/files/2586113524.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/96395396714.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/15727756349.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/sugopisatipopuporebis.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/jesetexigilaniditurilaf.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
9826c6c3830281e5ae179459e48908ad94a7cd6a16ea40173de5ccd21f24dcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 4588 bytes
font_01_sfnt_off0000ec0a.bin
ce1baaa1dfba9a934fc52e2c84e4c80ff27fb4117c525abd72340b721462e96e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 10104 bytes
font_02_sfnt_off00010ed3.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 16060 bytes

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