Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ae3b8585861f74…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 08:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dc2dd9c6d46471a5a262b965f51f6fe SHA-1: 7b5e666ca9406e2d58973b0778af0efd88953157 SHA-256: 78ae3b8585861f743058d353ab0338e6777b8b65b8983f803ded5dba170a477c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates malicious intent. The document body, though heavily obfuscated, contains the malicious URL and other PDF links, suggesting a link farm or redirection scheme to distribute 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.cc/wix?keyword=milk+and+vinegar+chemical+reaction
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/538d67_7aea9b22edc5429080bb7c085aa620c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_61e9ac62fda44b49bbb4f0c32d5f05b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_778fabad083c45bcac7329df819bf7d4.pdf
    • https://static.usrfiles.com/ugd/ae059d_0939a7b1f3064485982555091a1ddcea.pdf
    • https://static.usrfiles.com/ugd/544c7e_39800d85929d47c08d1dbd1f296e24be.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/jerexidakufisumatewexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/79606253892.pdf
    • https://cdn.shopify.com/s/files/1/0438/6104/9494/files/hilti_anchor_bolt_data_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_715346d638d14508a09eaaf21faff564.pdf
    • https://static.usrfiles.com/ugd/2e79a6_c1b4adfd05fa4572b50c89cb412b75d3.pdf
    • https://static.usrfiles.com/ugd/c0b427_291cfc47c06748e8b7a3ebcbdd233b2d.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/2015_kia_sedona_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/58553210065.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006376.bin
a929cfc2afe49506f5c6131840c38f460699fd7c93d837ade764b691f4b0ba17
pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5092 bytes
font_01_sfnt_off00007493.bin
cdccb37a83f98d4e011b3f17bdf1cbcd90275bf3c42f2b48184de6518d8f0216
pdf-font-stream PDF embedded font (sfnt) at offset 0x7493 10344 bytes
font_02_sfnt_off000097c3.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C3 4324 bytes