Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2a03169c4853a5…

MALICIOUS

PDF

38.5 KB Created: 2020-08-10 19:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 828d80bf0153f117eb37936a3fb1871d SHA-1: 2886b5f2081e673dcdc41860f3107021348b15aa SHA-256: 0f2a03169c4853a5136f600530ddfc0c5847ff37ac231fd721a5612cd03326b1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=business+vocabulary+in+use+advanced+2nd+edition+pdf`. This indicates the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The presence of numerous external PDF links, many pointing to unknown domains, further supports this. No scripts were extracted, but the embedded URL and link farm heuristics strongly suggest a phishing or redirection attack.

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.ru/pify?keyword=business+vocabulary+in+use+advanced+2nd+edition+pdf
    • http://files.lenakhalaftuffaha.com/uploads/1/3/0/7/130739443/2148497.pdf
    • http://fuxorab.herricktwp.org/uploads/1/3/1/6/131637814/zagijowalun_welivezigudupo_vuxatuvegix_metiz.pdf
    • http://files.porratatribetravels.com/uploads/1/3/0/8/130873983/336e69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0444/3032/7975/files/amenore_primer_dan_sekunder.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/heterogeneous_catalytic_hydrogenation.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/bioremediation_of_crude_oil_contaminated_soil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/70522804756.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/dimij.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/32444884907.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/tratamiento_absceso_cutaneo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/47182216528.pdf
    • https://cdn.shopify.com/s/files/1/0440/9635/6504/files/14364513583.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/the_berenstain_bears_go_to_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/82072419959.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/sho_oulth_horror_of_oryx_mars.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049de.bin
e1dd7fe66c10aaf7f2afb44c79ef2d282a15b77aca6890e72cf595ac6ad0b061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DE 5512 bytes
font_01_sfnt_off00005ca8.bin
c791e7aaa28cb3a9e13e1053ecfd205ce334569e4e137a06aa8c25790c32bf9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA8 9988 bytes
font_02_sfnt_off00007ec8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 4324 bytes

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