Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837a8ec99838c05…

MALICIOUS

PDF

54.9 KB Created: 2020-08-05 11:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a02c678eb34c280d665e46e69616f81 SHA-1: f564f5e7e2d3f70037021eb88d767a756cbc7430 SHA-256: 0837a8ec99838c0526c155d937fa7e550709b5ae8dcc7c2b86decbbfdb3a09bf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links designed to appear as legitimate resources, but a critical heuristic identified a malicious redirector link, https://ttraff.cc/pify?keyword=waste+management+project+pdf+download, which likely leads to malware. The document body, though heavily obfuscated, contains references to 'waste management project pdf download' and the authoring application 'wkhtmltopdf', suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=waste+management+project+pdf+download
    • http://files.stlawrencedistrictmedicalcentre.com/uploads/1/3/1/4/131454549/gozesutovaji_xiroduwatinexad_kumamojiwere_lalodebe.pdf
    • http://files.lisawisdomartist.com/uploads/1/3/1/6/131637147/e04ed05993.pdf
    • http://files.twwrealestate.com/uploads/1/3/0/9/130969837/edc82cb.pdf
    • http://files.illuminationcinema.com/uploads/1/3/0/7/130775971/nebufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60527157158.pdf
    • https://cdn.shopify.com/s/files/1/0431/7727/9652/files/towidik.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/chief_keef_albums_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/67572401902.pdf
    • https://cdn.shopify.com/s/files/1/0436/2190/8640/files/71984439421.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/shinjuku_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/lubetetexuwijije.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/53636459052.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/nimodul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/59956102231.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/habanera_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/ruwanedemuter.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_off000098af.bin
f1b4338a40923530e0ee8bee4312db754c03c9a9a2775844e51b063976b659f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AF 5656 bytes
font_01_sfnt_off0000abf8.bin
532721f4daca5377a5cd6ebf5519cd98fc83cdef1b7bc8576488bae30e1735a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF8 9980 bytes

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