Malicious PDF — malware analysis report

Static analysis result for SHA-256 2463fe2d8049f955…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb08eb8018ac955e22a32ffbcf218cc7 SHA-1: 36bfed0e852afeddacd1d26a92872ecb1aa147ca SHA-256: 2463fe2d8049f9554108f0ee9d56493ab87f5bcd2dc90a37670039d4e80e1739
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=games+2019++free'. Additionally, it hosts a large number of external PDF links, many of which are hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to free games, reinforcing the lure.

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=games+2019++free
    • http://files.mountvernonpw.org/uploads/1/3/1/4/131452794/2b2e72e00be.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/zutoxetozibawogafovek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/xefipipiketaxamuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/xirokipilor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0486/files/58325663939.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2041/files/49202454279.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/76364744496.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/wabizeromunumomivinelagop.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7471/files/sample_election_ballot_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/1315/0632/files/29324361420.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4647/files/b_scan_ultrasound.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/89494000232.pdf
    • https://cdn.shopify.com/s/files/1/0444/3809/3990/files/sudden_infant_death_syndrome_sids.pdf
    • https://cdn.shopify.com/s/files/1/0435/7698/3713/files/banking_industry_outlook_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/17782046207.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/cambridgeshire_family_information_service.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_off00006886.bin
5d66533fc2b24d7c501f85cc21fe5b79ec0f4b1526dd455020f1f5031c416a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6886 5392 bytes
font_01_sfnt_off00007ace.bin
1b74f1edf0afc5e002147d081af0bba1843286219baa26f8975fccfba0c2ea5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACE 10364 bytes

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