Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd09e9447c2d69e…

MALICIOUS

PDF

41.7 KB Created: 2020-08-19 03:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4a427a3a0d3e6fd1f3ee6fa2f52db8 SHA-1: 350c02fe406a828d904dff8eaac54ac5509c7765 SHA-256: 3cd09e9447c2d69e7fbf1687f37b350b08bf5618afa43db91af11be57fa22458
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is presented within the document body, disguised as a link to a free AWS certification book PDF. The document also contains a PDF link farm heuristic, indicating a large number of external links, many hosted on cdn.shopify.com, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=aws+certified+solution+architect+associate+book+pdf
    • http://files.brendaknows.org/uploads/1/3/1/3/131382134/eb431082870fc8f.pdf
    • http://files.limassolsportsmassage.com/uploads/1/3/0/8/130874129/laxuvovobopekidom.pdf
    • http://tuwemuju.aedt4200thesiscourse.com/uploads/1/3/0/8/130874359/jufuzusokoguguk.pdf
    • http://files.utopiafilmfestival.org/uploads/1/3/1/4/131407625/6cedbbd6fed0d.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/60357452166.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/najasegetagofegadumazeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/katotoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/20773906809.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/twitter_api_post_tweet_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/75764078268.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/the_turing_test_xbox_one_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/pivevaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/terewexivet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/andrew_ng_deep_learning_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0927/7095/files/management_of_bradycardia_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/noxotorokokutokujoliser.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_off000062c7.bin
cc25d243b245a898a3ee619317f4d8ca22e5fd027675571efff9747dc40ede39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5528 bytes
font_01_sfnt_off0000758d.bin
03881fc6c9a4187d7f310895222b609f0175ef9163f96477a8b376dfd47307fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 10524 bytes

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