Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d4583fe012797e…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 16:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083fc396e7cca61c7c5b1d3fc1d8feb5 SHA-1: f777e53338db89a785b3c3cfd47315a7f127e074 SHA-256: b8d4583fe012797e114e7a1a98af9158d94188c3c8725330992cb04926c2d2b0
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=radio+astronomy+textbook+pdf
    • http://files.corinnelightweaverstudio.com/uploads/1/3/1/1/131163559/6531203.pdf
    • http://files.colleen-pearson.com/uploads/1/3/0/8/130874254/2c916a.pdf
    • http://files.henestrosastudio.com/uploads/1/3/1/4/131438538/pukupale.pdf
    • http://files.gardensourcesc.org/uploads/1/3/0/7/130739626/9432076.pdf
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5701/files/34890981469.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/alopecia_androgenetica_en_mujeres.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/70092537539.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/rojamax.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/financial_accounting_b._com_first_year.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/99658985773.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/zejasakanotezenakafonaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/a_letter_from_birmingham_jail.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/comment_attirer_l_argent_rapidement.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/canon_mg2900_ink.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/88179059451.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/22147531638.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/58364160819.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/66930160442.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_off000068bc.bin
0725f7a409edee228f3fbe3a1f367da7599a4b6f32ce28692336ac98760942e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 5536 bytes
font_01_sfnt_off00007b89.bin
c89bbf6442547ae62317e0ac34f73d05fec2e2f51fde013c7c149d674a62d43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 10208 bytes

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