Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25270e39e2aec38…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da1a72c0d167b895cb411cab73c50e54 SHA-1: a1dd67b62ccc91eb8bac05e7fc05e876fe11cc57 SHA-256: d25270e39e2aec38df3815833b71448f791febf606d8e2ab86481089b5280664
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as an academic resource, which redirects to a known malicious infrastructure. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to redirect the user. No scripts were extracted from this sample.

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=adolescent+development+book+pdf
    • http://files.lisakellymurals.com/uploads/1/3/1/3/131382595/5a1062177d9a.pdf
    • http://gekatex.strips.ie/uploads/1/3/0/7/130739590/fudekoxamabaro.pdf
    • http://files.bttau.com/uploads/1/3/0/7/130738771/lijem.pdf
    • http://files.coachingandcounsellingottawa.com/uploads/1/3/2/6/132682171/a7c809e31ec35b.pdf
    • http://files.stampingcolor.com/uploads/1/3/1/3/131380126/wosenodez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/16474587011.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/star_wars_battlefront_2_ps2_cheat.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/kokegovamenufedagowafisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/54441128005.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/talutorelidamigemajutoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/jefidisijotuzelubex.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/kazuvodakitolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4654/files/90113329828.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/34868008086.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/4616861290.pdf
    • https://cdn.shopify.com/s/files/1/0450/7402/2550/files/forex_swing_trading_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/vatukowakiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86187089948.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/bafofalazaviwalifiwebiwi.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_off000067db.bin
3f9e0b8a9f4bbb266328f50130f7301d786a3de87b5cb5e981180a199dc0a57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 4988 bytes
font_01_sfnt_off000078c5.bin
3c09708ea7cabd6d8a33ec1e48c1bd8a677549017e0d97bed929eee45c8f638f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C5 9920 bytes
font_02_sfnt_off00009ab1.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB1 4324 bytes

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