Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2302a3c75f45189…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 01:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1510ace2ccce67424976d46d7cff93 SHA-1: d1e73a12bc2e255e532a46925d404d8ea8ecdbe8 SHA-256: c2302a3c75f451893321b7540d697b95dbd20373b85c00fb860afc8ddef518dc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to watching content online and a URL that mirrors the malicious redirector. The presence of a large number of external PDF links further suggests a link farm or redirection strategy.

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/wix?keyword=watch+fun+home+online+free
    • https://cdn.shopify.com/s/files/1/0434/5816/6949/files/binomische_formeln_arbeitsblatt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/51383496236.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/63568518622.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/sizonibujezatoziwewav.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_6a01b5a03b8146e88678dd83737a3f1f.pdf
    • https://static.usrfiles.com/ugd/ee6770_dc8bb9d9370741d889d88ee178f9d57a.pdf
    • https://static.usrfiles.com/ugd/7ff653_d8f49fc5053d430ca2d6772e5ab6ae8e.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/jinedobumubufedikem.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/sanford_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/5206/4917/files/70803283133.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/52053578413.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/eclipse_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/rilimasamuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/gajujupiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9557/files/kazidokugutobimovasepoki.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_off000064c5.bin
68a70400b46ae49b0cb9250393c3bef60b9466301ff77373544b8288ed665284
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 4956 bytes
font_01_sfnt_off0000757b.bin
a78497b47c70451980fe6b263ad65cbf7eee3b3f266792605c3bbfe99fce0001
pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 10352 bytes