Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce65ce58f71bdfcf…

MALICIOUS

PDF

135.5 KB Created: 2020-08-03 08:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d760f8cfcf1c84a8042391668005a2a SHA-1: f1d07848cb14c3f393d97f33662c53aa4661383c SHA-256: ce65ce58f71bdfcf0262d95e17a51daa6ff76df5903bd88ff2082e5afd8f2e33
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of a redirector link pointing to known malicious infrastructure. It also contains a large number of external PDF links, suggesting a link farm intended to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=boas+mathematical+methods+solutions+pdf
    • http://files.permittechnation.org/uploads/1/3/1/1/131164016/72120.pdf
    • http://files.herbesque.com/uploads/1/3/1/6/131637037/fuxarazab_negoxe.pdf
    • http://files.dancedynamicsne.com/uploads/1/3/1/4/131409677/vidakonefuk.pdf
    • http://files.greenmannurseries.com/uploads/1/3/0/7/130775741/f667202b.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/49833045434.pdf
    • https://cdn.shopify.com/s/files/1/0429/6012/6118/files/natixedasovidavuzuxivap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/thumbs_up_emoji_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97098861098.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/50201228254.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/how_to_create_maven_repository.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/52339768650.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/97454484041.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/puwugonefakori.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/85659533339.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/xuzitebelavewadip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/roblox_perlin_noise.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f6b.bin
ebac2e3d5e9d6a82a1f0c903457b941d1dab808d82616d2c292427c6771666b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6B 5348 bytes
font_01_sfnt_off0001b174.bin
59ec38eba80c06cc992a8643aa1352f41f517cc4a529e37a794f06f263915b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B174 2464 bytes
font_02_sfnt_off0001bbb7.bin
13b3f745ffaa7dac4d50ba3d84131c1a5d2cb5d631c0e10715fe1adda9c44470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBB7 19436 bytes
font_03_sfnt_off0001f8db.bin
211229cf39a9bcb2ea826771c55e502bbdabebe62527ee422447456575e38dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8DB 16652 bytes

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