Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfbe3bcde51a208…

MALICIOUS

PDF

34.7 KB Created: 2020-08-04 09:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a3de04f42f11e9ce53e04003cc8ec4a SHA-1: 006aeeef10ee974232381957659bb9b3989752a9 SHA-256: 2cfbe3bcde51a208c87835ee5e3d037f4ecfd732c7286330e7e36d2aee6afb24
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a lure for users to download further malicious content.

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=fundamentals+of+astrodynamics+and+applications+pdf
    • http://files.sisterhoodofchristianentrepreneurs.com/uploads/1/3/2/6/132681647/0204eda.pdf
    • http://files.randallbmusic.com/uploads/1/3/1/4/131455463/3228748.pdf
    • http://files.readingthechinadream.com/uploads/1/3/1/4/131438419/dunakika.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.orduns.net/uploads/1/3/0/8/130874495/nerukizujifomug-juzetevilivab-tafafuvivamin-wepabelijiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/python_dijkstra_heapq.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/garikel.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/tinkers_construct_more_materials.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/troybilt_5550_watt_generator.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/38802598449.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/71469131137.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/puvojajupap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/62776757994.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/zafujopefososemerifejexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/wupubelubipakuzopumaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.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_off000049f3.bin
7a197b9cd68c33c580cbeef7c6364666bdf88755667e019fa1eabba9a415c968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49F3 5360 bytes
font_01_sfnt_off00005c24.bin
e95c39ad283b9d0ef43dba0a5ee3864acddea004d3fb00b54bb5c9db96fe0340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C24 9692 bytes

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