Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b9722a78ec4373…

MALICIOUS

PDF

40.6 KB Created: 2020-08-04 01:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdc504b4aa9af39afa739fedbecf0361 SHA-1: 84c1630d8efccfe9ec68bd4e4f2fec01f1de3fd6 SHA-256: 44b9722a78ec4373bcef5a0e2a10f26e1bdcdad9f1482011c116dee4e45769b6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'computer networking pdf' and the malicious URL itself. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. 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=basic+terms+of+computer+networking+pdf
    • http://dimulek.david-briggs.com/uploads/1/3/1/3/131383297/mavoso_sepodu_jugixigibipo.pdf
    • http://xivadef.lorneeckersley.com/uploads/1/3/0/8/130814124/kamupexel-vexexedizese-niwanakazoruwa.pdf
    • http://files.brandonarthurshindolcsw.com/uploads/1/3/0/7/130775831/josofufewogebap-pakaniwotuza-futotanezakogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/genavudufemarutulofege.pdf
    • https://cdn.shopify.com/s/files/1/0438/2156/4066/files/57466509176.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/pujodinegoxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/88653314648.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/29264384866.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/bulibazijikifa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/33702507036.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/dewow.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/rexebeduxele.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/pijelagow.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_off00005ece.bin
c0b0894f36372ffaa35482c2a54c51dc84aa8d62279197f6a4169041695a32d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECE 5648 bytes
font_01_sfnt_off0000720a.bin
725f7e010c977e1dab492ed9c3f67b6291cbea0eb08be2555878348d7bec8da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 10384 bytes