Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61ac4de5f182c09…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 00:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca478a7370978c249346afa2a1a6a11f SHA-1: 3c60a9336cf76988906fcb64998ec9273b7b1d72 SHA-256: b61ac4de5f182c097d3fa0baafce8866911b39fcf6a18d9fec8f94ebe63c57ba
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to shopify.com domains, likely for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body contains text related to 'banking awareness pdf download' and includes the malicious redirector URL, suggesting a lure to download malicious content. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=arihant+banking+awareness+pdf+download
    • http://files.szconstructionweimartx.com/uploads/1/3/2/8/132814241/55482d.pdf
    • http://files.fortitudedance.com/uploads/1/3/0/7/130738673/zujeru_poxepafavugofuj.pdf
    • http://files.garrettzuercher.com/uploads/1/3/0/7/130775698/fc2b02421800.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/mathematics_definition_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/77564797331.pdf
    • https://cdn.shopify.com/s/files/1/0429/9777/6543/files/soxitinukuxavarezisuvawib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/bascule_jk_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9396/files/rti_application_format_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/78491908366.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/monterey_craigslist_org.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/tataporegupifubolovalaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/tx_surcharge_indigent_form.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/spider_man_far_from_home_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/dibabufititidaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/lg_dp132_dvd_player_manual.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_off00005d7f.bin
0e28f6a54f1c3cca6b6ab7a1cf9992f44b1332ad765a50a8edaa343e4548de4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7F 5588 bytes
font_01_sfnt_off0000707b.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 2116 bytes
font_02_sfnt_off00007a46.bin
29590364facdc34e447115c91fce9c6e522bb5a8ea99401b04e6f5d19b8d9ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A46 10376 bytes

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