Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4ab2b2cb46ba43…

MALICIOUS

PDF

44.9 KB Created: 2020-07-31 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b402ace4373daa40205248ccbc3be0c SHA-1: 24bb5ee3fdba131d6f01541f06bf47a995102742 SHA-256: 5a4ab2b2cb46ba4392689a5340b7fd184e2915ed7dc8eb01af80e7ba1253df38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One prominent link redirects to 'https://ttraff.ru/pify?keyword=bob+marley+jamming', which is flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a malicious site.

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=bob+marley+jamming
    • http://files.teresele.com/uploads/1/3/0/7/130775704/feposuguninu.pdf
    • http://files.nadi-haas.de/uploads/1/3/1/4/131406433/c8d82aec4f.pdf
    • http://files.justjule.com/uploads/1/3/0/7/130775405/lubuwo.pdf
    • http://files.taxjustice.uk/uploads/1/3/1/4/131437984/nunonesim_wugizigokuzoxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/xebowinazimufitakovusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/88748662484.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/gigopozebifevezifomux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/bufute.pdf
    • https://cdn.shopify.com/s/files/1/0434/7366/6213/files/vefiduvexorivitowixupizas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/98758497785.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/26580847422.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/31671532796.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/product_report_card_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/38112509621.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000624e.bin
dac34bb6518a263f202a71519b26b5ab106eb4df3da4bbc73db142062686cde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 4900 bytes
font_01_sfnt_off000072d8.bin
69b3c9d405bee3a05a8a0adc354e854cdaea2e131356cc360ab849faf3ad2d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 11992 bytes
font_02_sfnt_off000098bf.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BF 4324 bytes

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