Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4304764d9e9eca…

MALICIOUS

PDF

48.4 KB Created: 2020-08-28 00:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da479052ca071d2b6823842a97bce04 SHA-1: d8e8bddb5e5fbfd4ea9f1b71502125a2715683e3 SHA-256: bf4304764d9e9eca419742cf15fe5618cabfacdc2ad747b3463747fb45468ae6
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=snow+leopard+iatkos+s3+v2'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting the primary purpose is to lure users to malicious sites.

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=snow+leopard+iatkos+s3+v2
    • http://files.innovativecare4u.com/uploads/1/3/1/4/131408280/wigununuju-bupeweriro-milopifafapusad.pdf
    • http://files.ashlandfiredept.com/uploads/1/3/0/7/130740124/mapagugilupusigikit.pdf
    • http://jelob.effinghamelementary.org/uploads/1/3/2/6/132695839/mewuwokutiza.pdf
    • http://files.soulutionscounselling.com/uploads/1/3/1/3/131398204/7451699.pdf
    • http://files.meredithglisson.com/uploads/1/3/2/6/132696016/3509099.pdf
    • https://cdn.shopify.com/s/files/1/0432/3357/5075/files/jawbone_up_move_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/84365302496.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/magavun.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/xojaruwanunogokige.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/43868426119.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/818563683.pdf
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/wubijisaraza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/duxuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/15397701312.pdf
    • https://cdn.shopify.com/s/files/1/0436/5156/3670/files/automatismos_elctricos_neumticos_e_hidrulicos.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/unable_to_add_text_to_document.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/buxasupojusimurufo.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_off000069a4.bin
03ff566812dd2f0d356656f10e88b49cfae34305b76122074aeead09dcb16b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A4 5568 bytes
font_01_sfnt_off00007cb7.bin
317bf140d3ab042f551b9ef99017296cfe64e5b67638a657a90bfda9534d5cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB7 9920 bytes
font_02_sfnt_off00009ef6.bin
e66abfbeddc1d19d92dcb25e98d0a5acfcfed5afa902c0cdbe1883ebc60d8997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF6 16392 bytes

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