Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a32f4629ffda3c6…

MALICIOUS

PDF

45.7 KB Created: 2020-08-21 17:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdc60dd375b102cca344735fcc32099a SHA-1: 90a28c6bf7e3aacb3cebe86012734cbf6b4f21ff SHA-256: 3a32f4629ffda3c69b55004f967eb0fa7bbe3d2e04453ae17491b7cfa338aca4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'sad bart simpson clips' and includes the malicious URL. This suggests the document's primary purpose is to redirect users to malicious infrastructure. 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=sad+bart+simpson+clips
    • http://sixatux.katiedunivan.com/uploads/1/3/1/4/131406893/f12ce6045ecaf.pdf
    • http://files.ballesteroselmer3d.com/uploads/1/3/1/3/131398259/dokutigad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8018/8058/files/pokemon_trainer_sprite_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71419102660.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/novome.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/botadadubonawepiwezus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/88584326615.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/ralufasiwuzuromawir.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/91204799184.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_off0000739a.bin
c85e9cb9dbf4ad6fe4ba22a4cc986ab11da366c0fac4664b4c787e9c9f2a76a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739A 5460 bytes
font_01_sfnt_off000085ff.bin
61dcd69c20773cb683eaf89db3b4c5bacec502930873b10a67d1fb73f50f543c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FF 10796 bytes

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