Malicious PDF — malware analysis report

Static analysis result for SHA-256 e897d0baee477d6f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 04:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83b02d611de8cdf6b00d3c383a97b98 SHA-1: 340ad8b5d9aa58d91b37f0b0e3aeadc53eda7074 SHA-256: e897d0baee477d6f5ab62adc9b0d49ec33ec2bb87deb589a2fbbee6a8614e874
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.com/pify?keyword=werbung+blockieren+android', is identified as a known malicious redirector. The presence of this malicious URL, combined with the overall structure of the PDF, suggests a phishing or scam attempt designed to lure users to malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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/pify?keyword=werbung+blockieren+android
    • http://sogewun.teamtruebelievers.com/uploads/1/3/1/4/131406950/dbd11eb86d47059.pdf
    • http://files.keepdivealive.com/uploads/1/3/1/4/131407274/6612271.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/intravenous_calculations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/gcf_and_lcm_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0447/4650/6391/files/lullaby_of_birdland_bb.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1072/files/31580353645.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43561311815.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/55892046468.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/muvakeka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1480/6937/files/application_for_leave_of_absence_in_office.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/79026746720.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/46606375607.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006234.bin
e4b8da52521d21f36aa96113eb46302f486408887cdb556b55971edf0fe3c280
pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 5148 bytes
font_01_sfnt_off000073c9.bin
d785996fa7660b33d048ede5516c7130007be10b77631b855ea26ab8a489cc69
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C9 11044 bytes