Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef239ff3101d4a21…

MALICIOUS

PDF

120.9 KB Created: 2020-08-04 08:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0adec634dd7d7f11b16cdbdfe81d387f SHA-1: b0808cc677d029aa89d0eba4a1e2c641f6cda814 SHA-256: ef239ff3101d4a217371275ee25452806e9fe52ac26b77f9d06c70ae0830286d
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=augmentative+alternative+communication+pdf', points to a known malicious redirector. The document body appears to be heavily obfuscated or corrupted, but the presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic.

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=augmentative+alternative+communication+pdf
    • http://files.letsgetlegalnz.com/uploads/1/3/0/7/130774990/8579196.pdf
    • http://files.rivusllc.com/uploads/1/3/1/0/131070309/wilebirunut.pdf
    • http://files.ramblingsofthepen.com/uploads/1/3/0/7/130740316/pokesisomewegup_jemoj_tevepaveni_limekufivekudel.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/25179175892.pdf
    • https://cdn.shopify.com/s/files/1/0436/7020/8662/files/gonipabakedesebopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/north_carolina_new_hire_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/95750096997.pdf
    • https://cdn.shopify.com/s/files/1/0434/4594/4481/files/past_simple_and_present_perfect_tenses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/vizio_remote_code_for_directv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/tixixogixetikatikananamur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/95745862674.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/zotupajefajukipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/wasigujaribosipipaketaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/dapanaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/dawuwenamolotalilapalubaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/jipitetebarom.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_off00019e58.bin
2580b4181cee0bdbc5a75ac775e07966b4a9b943622f4a23dc89991d7aecca9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E58 5348 bytes
font_01_sfnt_off0001b07c.bin
49a1834eeb292c111f749c196f6a41315d77ac7fd56cb5371a0ad57b5874f010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B07C 10812 bytes

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