Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b3b3786079fcf…

MALICIOUS

PDF

37.8 KB Created: 2020-08-25 05:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1757338ead321ad5c55125d7e0be8313 SHA-1: f0360b82c93fceed8cd9848ae4c7cfc20161ac6c SHA-256: d19b3b3786079fcf1440a41c4bd557c13e4d1406885432ec879ba810268af172
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=apa+format+page+number+citation'. Additionally, it exhibits characteristics of a PDF link farm, with multiple embedded links, one of which is 'https://cdn.shopify.com/s/files/1/0428/3170/8316/files/49436218281.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to APA citation formatting, suggesting a lure to disguise the 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=apa+format+page+number+citation
    • http://pafilewof.allan69.com/uploads/1/3/0/8/130874253/vifova-wifebeseb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/49436218281.pdf
    • https://cdn.shopify.com/s/files/1/0430/7143/9001/files/gutugebupetamovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9202/5249/files/geology_field_work_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/caustic_soda_msds_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5899/5095/files/abecedario_y_numeros_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/klamath_river_fishing_report_october_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/9727/6064/files/bhakti_bhojpuri_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2186/files/47341440633.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_off0000575f.bin
82ac98490673d18d15b30f02fe52d674adf87bff046eaa5efec8acb0f4c011f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575F 5256 bytes
font_01_sfnt_off00006929.bin
f5939bd7229d7e17a320529e74f2ba192e80da4c1a218396163fe077aa4dfbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 9932 bytes

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