Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4ec45b9fc0b206…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 01:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd98aedaec15070cb3e34d979e98d93b SHA-1: 7f493617ddb43465024558db0ceea70e66d22b45 SHA-256: 5e4ec45b9fc0b2061c7a5ce4cd7cfdfb72c23db29501b584491755979dadb643
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lead the user to a malicious site for a phishing or scam operation.

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=toga+party+bed+sheet
    • http://files.jfreconsulting.com/uploads/1/3/1/8/131856549/83a09.pdf
    • http://files.pikefirm.com/uploads/1/3/0/9/130969681/kanavojemoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/sociologia_giddens.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3829/files/70312104190.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/bijuboxobizenenume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/rasiteg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/zavozowiniw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/complex_analysis_gamelin_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/2617/7438/files/los_proximos_30_aos_alvaro_gonzalez_alorda.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8764/files/22172469560.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/sociology_theories_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/dovejaduzagizuguluwaxajuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/phphotolibrary_get_all_photos.pdf
    • https://cdn.shopify.com/s/files/1/0447/8566/4166/files/adobe_reader_free_downloader_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/5620577094.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_off000068ee.bin
83df9fec7c87a166b059fae4b9900a87259f6491d73627359be310e9796cbf0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EE 5380 bytes
font_01_sfnt_off00007b31.bin
eef9e40149dc7e5f22a185fc2de41f0067e6c72f61e75f186215a67860207246
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B31 10332 bytes