Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b56a2109bfd57cc…

MALICIOUS

PDF

46.8 KB Created: 2020-08-12 10:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1627cbc32bffbc4dd6110921c3342d93 SHA-1: ff57b41b232f01a7d4ff7844887ef3b172f61487 SHA-256: 6b56a2109bfd57cc482705902155b0b544b0b8f0a235aadd9cb92e8415a8c501
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external resources, and one critical heuristic identified it as a redirector link to a known malicious domain. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely used to redirect the user to a malicious site, potentially for phishing or to download further malware.

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/pify?keyword=celery+juice+medical+medium+pdf
    • http://files.symphonyofhawaiianbirds.com/uploads/1/3/1/3/131381658/6440541.pdf
    • http://files.otodea.com/uploads/1/3/0/8/130874489/9577896.pdf
    • http://files.elsahenderson.net/uploads/1/3/1/3/131384656/remexirajete_rugexaxuxifub_vababinonubeki.pdf
    • http://tutes.satellitecityhall.com/uploads/1/3/1/3/131383790/489bc7ef1f0.pdf
    • http://panela.peterhendricksonarchitect.com/uploads/1/3/0/7/130738969/lulujes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/pavunat.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/45805757590.pdf
    • https://cdn.shopify.com/s/files/1/0438/7163/3563/files/transpose_of_a_2x2_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/amul_advertising_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0439/0790/7752/files/va_form_10_7959c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/bmtc_bus_route_map.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/dilazolikewikegikokosux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/84367583908.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/45303805572.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/adonis_creed_workout.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/fijofefabo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/95705078033.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_off00007896.bin
87a8f892b5414d4f6aa2448b4cf79fc44700d42e0e0bb1140a2918148f8d4fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7896 5204 bytes
font_01_sfnt_off00008a3e.bin
00f4e0c89be233dfeba4e511e72878d976978d6b8054a1b3a9bb99830dae2105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3E 10616 bytes

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