Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ac8b79b764f5a…

MALICIOUS

PDF

38.1 KB Created: 2020-07-25 08:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64041c30966d8f05678addaf081b35c9 SHA-1: 70288f00abc4b2a588fc5ef5390cf72dd63c4573 SHA-256: 610ac8b79b764f5a27293a6a0d420529272c36d7a0b6341b36938456303cbb61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains that host other PDFs, but one primary link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=speak%20softly%20love%20sheet%20music%20pdf
    • http://files.connollyspuppies.com/uploads/1/3/1/4/131438240/130b72893ebd.pdf
    • http://files.donesladventure.com/uploads/1/3/0/7/130740112/2077771.pdf
    • http://files.rachellepaintings.com/uploads/1/3/1/3/131383581/76049ebb.pdf
    • http://files.mwf-ec2019.com/uploads/1/3/2/7/132712358/komewubadoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/6965210923.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/naluzekofijatiroxutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/tadafitizuxezozefa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5390/6080/files/95839445284.pdf
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/42488985437.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/5179329266.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/zumavidirinuxadabejox.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/wudedejekopabitupewiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/wakewi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/nekuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/gutoruwadebero.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/dimoxakemumusug.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_off00005764.bin
646261ce6c954038ffcd75ae38b786b6946225afcad7c0f142cae2c4c9fadd67
pdf-font-stream PDF embedded font (sfnt) at offset 0x5764 5404 bytes
font_01_sfnt_off000069da.bin
bd2b69fb716207e4a2d2da4fbfd2c2af2d7e04e02f5ccda8a66b5bb5224dd8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 9672 bytes