Malicious PDF — malware analysis report

Static analysis result for SHA-256 348d434e5c9acc3f…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 19:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c47b73bbd73238d82dd424cbee7d379 SHA-1: 02b2b9ac58aba9d5f003beb1190ff36e8200796e SHA-256: 348d434e5c9acc3fff5e72cc760f8280033d71ed345ed501f5c2f5770f459fb5
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link to traff.com. The ML classifier also strongly indicated maliciousness. The document body, though malformed, contains the same redirector URL and several other URLs hosted on cdn.shopify.com, suggesting a lure to download further malicious content.

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.com/pify?keyword=problemas+sociales+en+la+adolescencia+pdf
    • http://lizinu.singaporenv.com/uploads/1/3/2/6/132682156/visegameve.pdf
    • http://files.cristinavillacreativeyoga.com/uploads/1/3/2/6/132681901/nulobo_xubolovavuxit.pdf
    • http://files.ltpaobserverproject.com/uploads/1/3/1/4/131410545/teburakejen_kuguvuvemabe_konobuxakasoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/vagerosujidezunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8695/files/bhagavad_gita_lyrics_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/53027008918.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/85454321119.pdf
    • https://cdn.shopify.com/s/files/1/0448/0771/7024/files/bohemian_rhapsody_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/vuvenoxav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49816413057.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/argumentation_skills.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/tajosaxawekuwisal.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/titanite_chunk_ds2.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/pujalobarizam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/53413024668.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_off0000675a.bin
4a2cc45cb8d2c4a630b74c623e14fe21f394bfb729f9e9c93a733614935e3f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 5444 bytes
font_01_sfnt_off000079a9.bin
d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 6068 bytes
font_02_sfnt_off0000895a.bin
2781913f9fe6a18115720bde3e611e7d85af0825fcde897778677be0204794ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x895A 11028 bytes