Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8cadf16adba4f1…

MALICIOUS

PDF

39.9 KB Created: 2020-09-17 07:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3920458a7ea1789e95d85eaea19afc05 SHA-1: 4883443e132937a46dd11c5e47b3dc90058332b4 SHA-256: 3c8cadf16adba4f1371e043c4a4df71235467265635d63a06e4a22ba1ef837f7
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service (ttraff.club) that is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious URL and a large number of benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=nutrition+through+the+life+cycle+fifth+edition+pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/tomobizitebedibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0663/9779/files/24762539641.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/ice_cube_put_your_back_into_it.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/conduite_a_tenir_devant_un_arret_cardiaque.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/mathematical_modelling_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0482/9547/7410/files/ravororadupoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/jujuperotupika.pdf
    • https://cdn.shopify.com/s/files/1/0460/2570/3583/files/renozixinoruzikiled.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/62653532580.pdf
    • https://3e5c2753-cdf4-42aa-b8fe-ed511eebd6db.filesusr.com/ugd/370021_b4174ad8deb0415c84619d1d5a4520ee.pdf?index=true
    • https://0dc5445e-6f23-4fc6-bfca-fde27155464f.filesusr.com/ugd/c8df25_8bdfb1e81db04f6e84575d4e0452646b.pdf?index=true
    • https://5ecc4b70-3673-499c-a043-cee80ca6eb40.filesusr.com/ugd/89602e_bdea91f1453f45c2881dba04c33ee54c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0462/2106/6393/files/viweziwolepuketeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/jukaresosojuliraxunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/gunomegap.pdf
    • https://cdn.shopify.com/s/files/1/0484/2992/4520/files/the_bullet_journal_method_book.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_off00004b57.bin
364ac309d977b4df24c0e7609e9eea23c7a23af06c4e0ece0a69aad592804615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B57 4984 bytes
font_01_sfnt_off00005c53.bin
27708925a7a2be2d11b0bbdb0e78223eefcbaa2fad9f88e3b07c4486d9e79438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C53 12652 bytes
font_02_sfnt_off00008424.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8424 4324 bytes

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