Malicious PDF — malware analysis report

Static analysis result for SHA-256 05154b1eb34fcfca…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 01:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b375f21a087ee5d7a0f7b9dc10269844 SHA-1: 5b445f88ac0a5028410f3f7c1fb027d435a711d2 SHA-256: 05154b1eb34fcfca5c3090ea33c06ed5991d7587f9d3e9c2f7455b19a38c45b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=exercices+aire+cm2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/kenmore_sewing_machine_model_158_manual.pdf
    • https://cdn.shopify.com/s/files/1/0463/3064/2587/files/2656252138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/gibevoxipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/puniravujediwen.pdf
    • https://static.usrfiles.com/ugd/6cf392_2f6872bc3fe84d519e18a96ef1483582.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/82750306306.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/sanupijelip.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/ataxia_types.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/android_support_library_vs_androidx.pdf
    • https://static.usrfiles.com/ugd/3dd68e_03451b73184744aeb27a55c026bea097.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b12ea54676b4fd69226921cd694a7aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_153ecf9950d243c89120531898891fff.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_off00005b0f.bin
a4b3451d098eb077a8e81e4884398cf588437df5200c5614418e2fb1abe06c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0F 5068 bytes
font_01_sfnt_off00006c37.bin
865ec2e6141a589bfe7d9a404b9293c35b5aeece8f84d461ef62b2089cf3acd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 11568 bytes
font_02_sfnt_off0000920d.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x920D 16312 bytes