Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1979ba299266346…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321e216b0fa075a990ada0e183a7b53e SHA-1: 57d0f3f779784487ff5826ba68f6a60bd23a4855 SHA-256: c1979ba299266346924c3daff76c7f36f20cab2fcab8f73092efb74c9abcb5fe
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or redirection tactic to obscure the ultimate malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous links aligns with common phishing or malware distribution lures.

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=chinese+phonetic+alphabet+pdf
    • http://files.designbyllewelyn.com/uploads/1/3/1/6/131607310/be7c3aa365b6.pdf
    • http://files.wisdomcambodia.org/uploads/1/3/1/0/131070178/worajebebumix.pdf
    • http://files.drrichking.com/uploads/1/3/0/8/130874123/f29a622591.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/wasalifilenenilelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/xuwuzefek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/22220791045.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/37398800142.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/wefivaxemavax.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/bncc_educao_infantil_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/russian_time_zones.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/greater_noida_metro_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/penguin_dictionary_of_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2917/files/flash_all_bat.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/jinufulukejinese.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/99891865954.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_off0000625b.bin
1a34a849ae81f836a609e0d278f9fef49cee222faa75bb395338cb48894925d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 3840 bytes
font_01_sfnt_off00006ff5.bin
0534e751fe93319a910815ff206cfc9b593d021b4b21d6a997a60f89b48644d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF5 5192 bytes
font_02_sfnt_off00008195.bin
d1bd2b768c3611a5f2239db57626b24e3433089213aa7665a5a1ce91a2cd3154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8195 11044 bytes

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