Malicious PDF — malware analysis report

Static analysis result for SHA-256 95305888c2887ca9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-02 20:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd5643844ab919fdba40c3ad3a84888 SHA-1: 6eb89d311749d0bfd5b92554279008be78545e7b SHA-256: 95305888c2887ca9e33aae120aa06ce95c0c51ee1a86111d39b80de28ca69889
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though corrupted, contains the URL https://ttraff.cc/pify?keyword=numerical+mathematics+and+computing+solutions+manual+pdf, suggesting a lure to download a fake manual. The presence of numerous Shopify-hosted links, while some are benign, contributes to a link farm SEO strategy to obscure the malicious intent. No scripts were extracted, but the primary attack vector is the redirection to malicious infrastructure.

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=numerical+mathematics+and+computing+solutions+manual+pdf
    • http://files.postnco.com/uploads/1/3/1/0/131069764/1259597.pdf
    • http://files.gbwgrassseed.com/uploads/1/3/0/7/130739892/nodoju.pdf
    • http://files.christinefoghmusic.com/uploads/1/3/1/4/131438616/65ebc12f62.pdf
    • http://files.mtprospectlimo.com/uploads/1/3/0/7/130775098/bixigosutogiveg-satutazikigu-jiwufumowe.pdf
    • http://files.spinalunwinding.com/uploads/1/3/1/3/131398097/3746671.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/mopalixobufutebogizopuvip.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/68523834955.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/39661720092.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/sotokoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/85683851134.pdf
    • https://cdn.shopify.com/s/files/1/0436/1591/2098/files/mubasomubodalineb.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/html_doc_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/bijivebujetenilitom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/ladagisaminidananupuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/67033779945.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/pamunipugodamevazubes.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_off00005193.bin
9a6e6a446db693f7c96855fe9daf23605a19d442d73f703ef9285d75e4ffae09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5193 4112 bytes
font_01_sfnt_off00006054.bin
ea35aaca1176c7a448d83205ef021fba54a69972cc077c2f9911b109bb49a672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6054 5536 bytes
font_02_sfnt_off00007300.bin
0dd9e523ca7787619607a8c706a3f124b7c7f1b2aaa1144547066761265219c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 9984 bytes

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