Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7894683181745a7…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6aeca162a3f72362a109117779e29b6 SHA-1: 77d27d99b9dfe694a6cdda7fda66011e837b80d6 SHA-256: d7894683181745a72cf073d38a215ab1e3a3211c3f54b5fbe66fc49bd42768be
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a malicious redirector URL, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to learning English, aiming to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=livre+pour+apprendre+l+anglais+pdf+gratuit
    • http://files.shermanlibrary.net/uploads/1/3/1/3/131398221/3669069.pdf
    • http://files.richardgmont.com/uploads/1/3/1/4/131406086/jitaruv_purogi_wufevemefer_soninigoda.pdf
    • http://files.mrtasmania.org/uploads/1/3/0/8/130873941/5723328.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/68103167736.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/mewulogof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/27815545797.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mafimovudowejiner.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/gisegufulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/29479898958.pdf
    • https://cdn.shopify.com/s/files/1/0437/4501/8017/files/powalikexakanuxupimofu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/approval_addiction_joyce_meyer.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_off00006491.bin
a9f33db3d1770fce38f45448e95103a57754bb032fb3f703869a693156e4e568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5208 bytes
font_01_sfnt_off00007665.bin
914f9a723eb0e3cff4ed1fd4fcf0940363bed1b234ba25a1857c9c94ba242cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 11672 bytes

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