Malicious PDF — malware analysis report

Static analysis result for SHA-256 158adc6472cbecc2…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 19:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b82e6dde816e2e579cef9c2a43834b SHA-1: c7a389cafb67dceca8f3993974ef9eea576112f0 SHA-256: 158adc6472cbecc2586ad73b9bac554fd140a5c9f9bbd553988e66c97f8605a7
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 24 external PDF links, many of which are hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=marathi+recipes+book+app+free, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same malicious URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure under the guise of providing a recipe book app.

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.ru/pify?keyword=marathi+recipes+book+app+free
    • http://files.youdesignleather.com/uploads/1/3/2/6/132682585/masebut_gawotumobavo_sivavule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0440/8783/6837/files/sipemutir.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/78343533582.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/87818506718.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/67438534090.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/temowoxejepoxom.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/pimebibugatujul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1057/files/xotunodatesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/jopuxededotiwude.pdf
    • https://cdn.shopify.com/s/files/1/0437/8882/8829/files/pavlov_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/poferujiledef.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/business_bookkeeping_spreadsheet_free.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_off0000488d.bin
a1d79727086ef928187f24196d6895ce3d6b4b52b4be1e6670219a191dc1c360
pdf-font-stream PDF embedded font (sfnt) at offset 0x488D 5280 bytes
font_01_sfnt_off00005a7c.bin
bfede9bce61057b9120cc8bad365b87db7f8f13480211fe82746655763086049
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7C 10216 bytes
font_02_sfnt_off00007dc7.bin
d6eb8d0eb82d60ba7cb32601b5616b76b80d6ece11e689311be8a3c36c506894
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 4700 bytes