Malicious PDF — malware analysis report

Static analysis result for SHA-256 c830fc4acae028fb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 06:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127465d33a042444655e64a481619f26 SHA-1: a62351f0506641b5616a7693c45a6d97911a52ad SHA-256: c830fc4acae028fb6a97a55412cea731f96b6bbcc39c4f1a3e26592893bab3e0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a redirector to known malicious infrastructure. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic. No scripts were extracted, and the document body is largely unreadable binary data, limiting further analysis of intent beyond the malicious redirection.

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=batman+who+laughs+comic+pdf
    • http://files.fllworkshop.com/uploads/1/3/1/4/131406785/e73c672.pdf
    • http://files.evolutionrattery.com/uploads/1/3/2/6/132681699/9337410.pdf
    • http://files.groovycoolstuff.com/uploads/1/3/1/6/131606467/0f465d4508a0.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://tavuz.danielealancarter.com/uploads/1/3/1/4/131483254/5111813.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/kekuperukolipu.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/cayaponia_tayuya.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/pixelmon_fire_stone.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/overstreet_price_guide_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/23576151618.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7757/files/large_printable_outline_world_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/26805689534.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/huffman_coding_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/77244942720.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/tuzevanixe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8175/0941/files/69946103762.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/playstation_portable_wallpapers.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_off0000680d.bin
deab17705d63f8bc02b7b89d7132d76de96dd6381e760f9f17790e0f53861618
pdf-font-stream PDF embedded font (sfnt) at offset 0x680D 5612 bytes
font_01_sfnt_off00007b1b.bin
2dfc9bb3ba403bf6a50c53a488209fccbbc35f37497055fdca82a55362a535d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1B 10428 bytes