Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b381b1c845dee…

MALICIOUS

PDF

44.2 KB Created: 2020-08-27 22:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d9466cc9de373000788981b9b816a5 SHA-1: ea960b59fd506fd605e1706c4bab9ea2f471bffe SHA-256: 781b381b1c845dee5b689aa21b4a84403634f3cbb5cb3e6369166bcc1a81105a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=free+cyber+coins+transformers+earth. Another heuristic identified a large number of external PDF links, many hosted on shopify.com, suggesting a link farm or SEO poisoning attempt. No scripts were extracted from this sample, but the presence of the redirector URL strongly suggests a phishing or malware distribution 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=free+cyber+coins+transformers+earth
    • http://files.ddtakingoutthetrash.com/uploads/1/3/1/4/131437919/3940782a64fff.pdf
    • http://files.theedgecenter.net/uploads/1/3/0/8/130814056/dawima.pdf
    • http://files.darasblingphotography.com/uploads/1/3/0/8/130874433/e3f61189d1.pdf
    • http://files.elmirabaptistchurch.com/uploads/1/3/0/9/130968984/4805100.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4512/files/xojopovupare.pdf
    • https://cdn.shopify.com/s/files/1/0430/6852/2657/files/manual_de_abordagem_policial.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/makerere_university_admission_forms_2019.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/squeeze_theorem_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/39750293331.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/39170271737.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/63650020720.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_off000070a8.bin
155d10dc062a4960a1a4099f2f1120f1062c051a3cf7424847738351c0eb5adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 5284 bytes
font_01_sfnt_off0000827b.bin
ca3e84731ff283d5d784fe33b470a0fd33b04fe98c66bb4a7e70ba13cab9c373
pdf-font-stream PDF embedded font (sfnt) at offset 0x827B 9864 bytes