Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43f072882ebcb44…

MALICIOUS

PDF

45.3 KB Created: 2020-08-22 21:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0c969a5de751d36502a6d2512df1a3 SHA-1: 97663242922f5892302f4eaa4ee63b3f1ec9b485 SHA-256: a43f072882ebcb44e89c6f4c8e47211a65c88aa8a0b9f03f6a8a4c59b1c789a1
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the book title and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous links to Shopify-hosted PDFs indicates a potential SEO poisoning or link farm strategy to distribute malicious content.

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=chronicle+of+a+death+foretold+summary+pdf
    • http://files.tasmanpilotcareers.com/uploads/1/3/0/7/130775677/5560499.pdf
    • http://pajagusuk.hannahstainedglass.com/uploads/1/3/1/8/131856713/6845910.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/17975328701.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/nixuvupupedawida.pdf
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/causes_and_effects_of_unemployment_in_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/petrarca_canzoniere.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/koxenurotefevutani.pdf
    • https://cdn.shopify.com/s/files/1/0450/4931/5478/files/knowles_andragogy.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/1458881736.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/lobivedudogumoxatudeges.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/adolescent_psychology_noun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/artrosis_facetaria.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_off00007412.bin
a1abb38c9dce78ee5da5a28b37035368389f84858328016fa8a502d4135deafc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7412 5404 bytes
font_01_sfnt_off00008642.bin
f53827fa322dd95941822ddc3c5d4c377c293fbfe7055c44dd9587bec0479301
pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 9992 bytes