Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa61bdc81df87a…

MALICIOUS

PDF

36.9 KB Created: 2020-08-19 09:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 465733f8a28e29b43bcd7d3e77a03442 SHA-1: afef53172c64e1d3bf76afe82d206b32937e0247 SHA-256: 70aa61bdc81df87ad9d24cec1d91d041a25947c2200ad62fed1980344d60cad9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'chalkboard wedding invitation template free'. The presence of numerous Shopify links, while mostly benign, suggests an attempt to blend in with legitimate content or create a link farm. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chalkboard+wedding+invitation+template+free
    • http://files.thegoldenruleboutique.com/uploads/1/3/2/3/132302916/konogiv_lijuwono_xalovobunugige.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/norman_rockwell_collector_plates.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9674/files/powers_of_income_tax_authorities.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/abecedario_coreano_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/94968697007.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/70761555510.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/internet_accelerator_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7932/files/jikigadutuviwefus.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/tipos_de_atonia_uterina.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/doloperakovixidegakikafag.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/adventures_in_middle_earth_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/fetudumejegapos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/zezobisotip.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000523b.bin
7eb691b848ee3e3087f9555af2763b3a6eb325c9716bc7432b9fbf7d9ad256d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523B 5540 bytes
font_01_sfnt_off000064f8.bin
f58c13ae4fbd70d174283236a5c9cd29c13b57155739e764cbb6f4ce1f69e007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 9920 bytes

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