Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1925a5d251c7e32…

MALICIOUS

PDF

59.7 KB Created: 2020-08-11 13:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90d1489427bc490f25c51b6f6a1251f SHA-1: 27f55589ddf4124e6e000a54e69e0134d846de88 SHA-256: d1925a5d251c7e3246e960ab6c0782aea3bd23aebe57a538e1693f1274449265
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also present in the heuristics and IOCs, suggesting a lure to a malicious site. 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/wb?keyword=defense%20mechanism%20adalah%20pdf
    • http://files.nodrogfarms.com/uploads/1/3/1/4/131437612/1500008.pdf
    • http://files.nellisvineyards.com/uploads/1/3/1/4/131452838/65464f56709ed3.pdf
    • http://files.jrsautospa.com/uploads/1/3/2/7/132710700/86fb1dba05c7.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/97961736335.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/anatomie_appareil_gnital_fminin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/emotional_intelligence_quiz_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/92274647513.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/74965456546.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/beads_jewellery_making_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/26238884496.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/15240847232.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/entrepreneurship_and_innovation_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/8074/4089/files/40739111699.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/paradise_lost_book_9_text.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/xujaba.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_off0000a1ee.bin
fd5ccd1857d06b927269e6f9e0b2e86af7760db04ecda56cf5517161c70b62a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EE 4896 bytes
font_01_sfnt_off0000b25c.bin
1b84a22e15b5ec1bf5e57e25be5ca835bc845dd5f485d68e6e1faed6c74d1bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 9932 bytes
font_02_sfnt_off0000d402.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 4324 bytes

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