Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bddd57814279a7c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-14 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c8f9f68f85622fc033870e39b316283 SHA-1: 5494e1be3d04d2269dd5884f0a61a2b78df214cd SHA-256: 0bddd57814279a7cfdb3622ccc4e02f29470643d7ee81a1b3e9f6417fcba7e68
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.ru/pify?keyword=all+important+full+form+pdf, is identified as a malicious redirector. The document body and embedded link structures suggest a link farm or SEO poisoning tactic, aiming to drive traffic to malicious sites. The presence of numerous PDF links, many hosted on Shopify, further supports this. The ML classifier strongly indicates maliciousness.

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=all+important+full+form+pdf
    • http://jafume.callahans.blog/uploads/1/3/1/4/131438216/4041219.pdf
    • http://negujej.sarahsummerwell.com/uploads/1/3/1/8/131856318/jirovamixinor_zivakagozebowav.pdf
    • http://files.drawingthelinewithlove.com/uploads/1/3/0/7/130775528/9909490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/1936087887.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/titijidutimilozekudar.pdf
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/90579910057.pdf
    • https://cdn.shopify.com/s/files/1/0431/1033/4620/files/sweet_dreams_bukan_cincai.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/53758331038.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/dobupo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/nedofiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/gapipibipojazutitig.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/nobinipubegiwupatubu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/33086366601.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/71886119290.pdf
    • https://cdn.shopify.com/s/files/1/0437/6929/9098/files/40668555181.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_off000064cf.bin
3a2ba23f3fc606caf5eebef652a67d4cb04e3806973f19cb08c3d74efc7a448a
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 4996 bytes
font_01_sfnt_off000075aa.bin
df2ab6ace23297535cf66a6d04eadf03c7bd1eda1c4a4d2cf2c75315a03a4c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 10156 bytes