Malicious PDF — malware analysis report

Static analysis result for SHA-256 3928d2b51a3f56b4…

MALICIOUS

PDF

54.7 KB Created: 2020-07-31 01:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d644d0e422502ec903f6e5833573da7f SHA-1: ac203712013832b4341c28f39253000229967db4 SHA-256: 3928d2b51a3f56b43d2544337e885a48bd4b67376552599453a62a2a0cf313ef
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains a large number of embedded links, identified as a PDF link farm. The primary redirector URL, https://ttraff.cc/pify?keyword=diet+meal+plan+to+lose+weight+pdf, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to a diet meal plan, likely a lure for users to click the malicious links.

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=diet+meal+plan+to+lose+weight+pdf
    • http://files.glamourouskitty.com/uploads/1/3/1/3/131379439/povatironomuwupagi.pdf
    • http://files.goodbless.us/uploads/1/3/0/9/130969424/xopixedawareda-wowukutozi-fevasutu-sekaligupoxijek.pdf
    • http://files.high-horse.co.nz/uploads/1/3/0/9/130969957/ruliger.pdf
    • http://files.chebeaguerec.com/uploads/1/3/0/7/130739646/8288100.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/famadafobolajukili.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/dirikebufotuwiludujaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/wotukinekegoleveresozozos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5382/files/3155181183.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/12371391211.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/tovejanivenajinat.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/zotutubimepobakodamisumat.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/40636413706.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/4914885440.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/83071723039.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/69305947383.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_off000098ee.bin
a25a6258d2e62d955941e6af78f1438f630d496bb20987ae67924642dd94d630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98EE 5240 bytes
font_01_sfnt_off0000aaaa.bin
5141d3458504ac6c7e811e1bc2978b4e99108ba13156f227b0f08992d386489c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAA 10240 bytes

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