Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d16d82a9c5190e0…

MALICIOUS

PDF

49.5 KB Created: 2020-08-17 01:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e903c7074b97f91b594b8802c236e9 SHA-1: 487b8dac5d93e0458236da2575121f052f4bbd9d SHA-256: 2d16d82a9c5190e0fcf1a668e6b057701886d8da883093fb1d531d77632afcc9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. The document body, though heavily corrupted, contains text related to 'Answer sheet ielts 2018', suggesting a lure for users seeking such information. The primary malicious activity observed is the redirection to a potentially harmful site via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=answer+sheet+ielts+2018
    • http://files.cedardifference.com/uploads/1/3/2/8/132815181/9526633.pdf
    • http://tutoronor.ohthehorrorcast.com/uploads/1/3/2/6/132682883/narij-gowotigub-velujewewoz-nimuma.pdf
    • http://rofeb.sarahbethart.com/uploads/1/3/0/9/130969336/a0600bce672.pdf
    • http://files.saginawcountyreportcard.org/uploads/1/3/1/4/131406348/xajab_vurikekigaj_bawojadufulezu_xegivoto.pdf
    • http://files.nastasivocalarts.com/uploads/1/3/1/6/131637099/samibumasirirorabaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0451/0292/3939/files/tabituxugatizibur.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/kugujo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/8664733626.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/mobixepamuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/86344953774.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/najorukizawevilawixugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/physical_geography_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/23731615403.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_off000083b9.bin
5844f2954213b7cc95ed8c82c8e77bf176f3bfc74744a6aeaa22ceed897281a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B9 5164 bytes
font_01_sfnt_off00009558.bin
eeabe2679b49d1e6c5f55d6388ec7963246bc421f2a1bc871c2de635e4981464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 10500 bytes

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