Malicious PDF — malware analysis report

Static analysis result for SHA-256 30527905070588ae…

MALICIOUS

PDF

52.1 KB Created: 2020-08-11 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bac666195dc0eb58976c25cddc870e SHA-1: 05e8ca9fd0e964abbcd26013db70d8a82931793a SHA-256: 30527905070588aea62a651873f2469803bc23019807cff1635780074ba16116
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a high ML classifier score and critical heuristic firings indicating it is a redirector link and a link farm. The document body, though partially corrupted, contains a URL that points to a redirector service, which in turn likely leads to malicious content. The presence of numerous embedded links, many pointing to shopify domains, suggests an attempt to distribute malware or conduct phishing by overwhelming the user with options or disguising malicious links among seemingly benign ones.

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=no%25C3%25A7%25C3%25B5es+de+administra%25C3%25A7%25C3%25A3o+financeira+pdf
    • http://files.upwellings.com/uploads/1/3/1/4/131453252/momomapafugiz_zuvoxetejade_majose_pubozevurexeguj.pdf
    • http://files.rmheatingandcooling.com/uploads/1/3/1/4/131437508/zaritif-semogugu.pdf
    • http://files.devihealing.com/uploads/1/3/1/3/131379409/jegajo.pdf
    • http://tiganaja.theillustratedopossum.com/uploads/1/3/0/8/130814124/3357561.pdf
    • http://files.scogbahn.co.uk/uploads/1/3/2/8/132814071/a2dc7.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/zirenali.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/voremazimodovewezaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/97731985898.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/83471053316.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/2818981906.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/6190086935.pdf
    • https://cdn.shopify.com/s/files/1/0439/1452/6872/files/50869653391.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/gelonumimotojeveg.pdf
    • https://cdn.shopify.com/s/files/1/0437/2473/4613/files/ripajevegerojul.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/pamekoguwuxupidufaji.pdf
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/adding_vectors_worksheet.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_off00008637.bin
fb6524add120fabbbca7a4154395d562eaf63f15a22705d900b9c39900be45c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 5956 bytes
font_01_sfnt_off00009901.bin
97781e6df0626042a090908c12b73a44ef93fba663f875e7bcc3f0bad58b91eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9901 13492 bytes

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