Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb43f8c1b1b43d0…

MALICIOUS

PDF

44.8 KB Created: 2020-08-25 09:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5f8c093cc83391554b4e52224fd814 SHA-1: 3c33292cb062d4b65e84d6cdca011418bab3e495 SHA-256: 8eb43f8c1b1b43d07afc389ca48dd356c7e0e53287dc349182b5b3851589bfac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=equivalent+ratios+worksheet+pdf+7th+grade'. This indicates the document is designed to lure users to a malicious site, likely for further exploitation or credential harvesting. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=equivalent+ratios+worksheet+pdf+7th+grade
    • http://duwuxijof.awp-wa.org/uploads/1/3/1/6/131637224/4379713.pdf
    • http://givup.constructionprogress.org/uploads/1/3/1/4/131482995/vevigomawob.pdf
    • http://vedajeb.dougandjaciscreations.com/uploads/1/3/1/6/131606349/xowefeduwudev.pdf
    • http://files.miravistallc.com/uploads/1/3/0/7/130776100/4023760.pdf
    • https://cdn.shopify.com/s/files/1/0438/0947/2669/files/roveri.pdf
    • https://cdn.shopify.com/s/files/1/0462/1503/7082/files/zemog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/pomif.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/21228726624.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/mapa_america_politico_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/77011107478.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/el_arte_contemporaneo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/vuvofiju.pdf
    • https://cdn.shopify.com/s/files/1/0429/6146/9596/files/jeranav.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/adjektivdeklination_bungen_b1_mit_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/vinyl_plank_flooring_installation_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000624c.bin
7389359352876d3b2fac629fbaa6712d4cc1e1f1010eedb07ecaf0080c6fe2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 5564 bytes
font_01_sfnt_off00007550.bin
37dd4cb2bec71c5eb350bf772fce7e122fb866d61b83686fad8bf13e68ff72b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7550 10024 bytes
font_02_sfnt_off000097b9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B9 4324 bytes

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