Malicious PDF — malware analysis report

Static analysis result for SHA-256 874fa105abfa48d9…

MALICIOUS

PDF

47.6 KB Created: 2020-08-15 02:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4ae87c76f5d512afe4239db7e9dcec0 SHA-1: 9b6a08f0cfeac82ae75bb1fbca530114fa805e3b SHA-256: 874fa105abfa48d9228b3db5ce58e3c55627e1ba21438daffca9a3a04143942c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes the text 'Chef's choice 110 user manual' and the malicious URL, suggesting a lure to a phishing or scam page. The presence of a large number of external links, many pointing to PDFs, indicates a link farm or SEO poisoning attempt.

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=chef%2527+s+choice+110+user+manual
    • http://files.flourishinglifesociety.com/uploads/1/3/1/8/131858747/tijabumupuwefi.pdf
    • http://files.makotokai-karate.de/uploads/1/3/0/7/130776312/mikog.pdf
    • http://velamif.jadeduo.com/uploads/1/3/0/7/130739678/2809350.pdf
    • http://files.brookingscountytitle.com/uploads/1/3/2/6/132683070/mapamokugififizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/93537218470.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/cancer_chemotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9849/6412/files/44678174402.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/datesheet_of_2nd_semester_private_jammu_university.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8918/files/ensayo_de_logistica_y_cadena_de_suministro.pdf
    • https://cdn.shopify.com/s/files/1/0435/4473/9999/files/career_planning_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/20654956543.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/xexitodabigalugevaperug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/derosejudov.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/54169537119.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/ansi_b16._5.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/vofojuvutudeve.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a13.bin
64f54c728684ad85b2eee7964e796c9030063b3934f85920f3a1e13cb969af4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 5256 bytes
font_01_sfnt_off00008bd7.bin
8d87de94f0df80f0d83a95f9d6d2ee3496ef62229399e9b15ea9f77162408f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 11040 bytes

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