Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bed0013a890444…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 06:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e030c9a5143f15f07bc50d2d22da575d SHA-1: ba58694d0c82a64cddd95b3b45a62ba88e49c707 SHA-256: 34bed0013a890444b0a12e70670eedba9267d0236d158b6ca975a4500e210f28
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=probability%20worksheets%205th%20grade'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be luring users to malicious infrastructure through deceptive links.

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.cc/wb?keyword=probability%20worksheets%205th%20grade
    • http://files.pasinfonia.org/uploads/1/3/2/6/132681558/luroru-putas-wasonorofadi-bukafutominosi.pdf
    • http://kenoxapu.dcaravanviral.com/uploads/1/3/1/8/131856190/a26a4.pdf
    • http://files.sovereignwellness.org/uploads/1/3/1/4/131438111/widosowasan.pdf
    • http://jadidow.standardsportfolio.net/uploads/1/3/0/8/130874284/5161114.pdf
    • http://doxitegu.jadeduo.com/uploads/1/3/1/3/131384281/bexazugibawizobej.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/36964133160.pdf
    • https://cdn.shopify.com/s/files/1/0434/9234/3970/files/36696678912.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/80106282974.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/43151748482.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/8991678147.pdf
    • https://cdn.shopify.com/s/files/1/0440/6784/8344/files/vuxajotukudinedija.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/luwurijaxit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/advertising_on_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/27102868309.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/vusaletatuxafesazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/4649583685.pdf
    • https://cdn.shopify.com/s/files/1/0438/4145/4240/files/16260542971.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/muzoro.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_off00006a8d.bin
4631c8d0e195086d4f3a06bd3a3e78a292347e8b36fd40b74831c196426acaef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8D 5612 bytes
font_01_sfnt_off00007dac.bin
4da8b7b9a1d581b7af9a6f583a0d29112637b74a5ed75a225b59d69f1e693361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAC 10388 bytes

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