Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedcd9031179fe86…

MALICIOUS

PDF

66.7 KB Created: 2020-08-08 00:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f38f01a28df24e612b3df11da387e75a SHA-1: 767c7b3a2061e9f4a2a11c9c456b971890e683d1 SHA-256: aedcd9031179fe86bd3bf8e25c74b7fdba3a09bc3731788b396baeaafaaf1ad2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.cc/pify?keyword=stochastic+calculus+pdf, which is presented as a lure for a "stochastic calculus pdf". The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing deeper analysis of the delivery mechanism beyond the link farm.

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.cc/pify?keyword=stochastic+calculus+pdf
    • http://files.teachforkosova.org/uploads/1/3/0/7/130739542/guwijumebono.pdf
    • http://files.hauntedmichigan.net/uploads/1/3/0/8/130814858/gemikisiv.pdf
    • http://files.circle-m-consulting-llc.com/uploads/1/3/0/9/130969761/61ca0aade95eec.pdf
    • http://files.lizzyarden.com/uploads/1/3/1/3/131398046/3386690.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/xugunewe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1171/6766/files/xovevasitovufalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/rrb_quantitative_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/5311/9648/files/what_does_arduous_mean.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/algebra_for_college_students_robert_blitzer.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/captive_prince_volume_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/resmed_s9_clinician_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/98710053080.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/xunenub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/clinical_bacteriology.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/74477434554.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1d1.bin
08c4ace1ff0578d65c8ec9b54b539b66680f256711db7b871ec6a4f61ae6f266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D1 5252 bytes
font_01_sfnt_off0000b3b2.bin
0a3bea9fcb29822ba61554d77dcdfaad3f0ba3e614762c72d2bea07a53cf545c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 16824 bytes
font_02_sfnt_off0000e760.bin
1420dafd1d7f2dfa761e853b28ae62ddd52b0317455c747556471704014b7400		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 16344 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.