Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fc713e89d3e0d6…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191787f8ac6775cc416c52d637d939f0 SHA-1: 69ca1d61d6f3dd9f42677d10a7d27134340cb331 SHA-256: 13fc713e89d3e0d607f379b3a062c30c026daba9ebde2c869a446d498f6fddb7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is a strong indicator of malicious intent. Additionally, it hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=assignment+abroad+times+29+december+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6213/9816/files/sosizojetuxamodugirepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/33544211785.pdf
    • https://cdn.shopify.com/s/files/1/0461/4186/6137/files/tozofifekeb.pdf
    • https://static.usrfiles.com/ugd/18122d_2e5ae082fe6a4af495ca96e4d02fc5ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef3a5826b81447a38677df76b31ebf58.pdf
    • https://static.usrfiles.com/ugd/b8c837_40eb60b50abe44e692d1f16c1938b99b.pdf
    • https://static.usrfiles.com/ugd/d01287_0cbc129fe1b749e18dd4bac989f513f0.pdf
    • https://cdn.shopify.com/s/files/1/0447/3703/6437/files/facebook_login_android_studio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/kogama_brazil_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/93117925468.pdf
    • https://cdn.shopify.com/s/files/1/0438/5583/9392/files/kipixutosivafoviw.pdf
    • https://static.usrfiles.com/ugd/3be3a7_edcc26d788f249ecbd06598003b88714.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5fbdb21f8294122bed343ea0e67c279.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005858.bin
44efdbef957e31fe3b8e3533c33c3fd8b0f884085aa28a6815cce4d2819fdce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5858 6032 bytes
font_01_sfnt_off00006cb2.bin
0ba7717cbed079101c1c3f13effd5e2712c017cae3fdeff1ebd82f83fa1fc9ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB2 11084 bytes
font_02_sfnt_off000091c5.bin
2a0e0db2741371e9ed62770e079d1c3af4c642b15c78536d4995ddcc38d58e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C5 16144 bytes

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