Malicious PDF — malware analysis report

Static analysis result for SHA-256 3585840b32e6014f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 11:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df6cc646552cf92804b6fcca91f86614 SHA-1: 51236c5dd567c7aa3b1e9f4f5f73b8251485cff2 SHA-256: 3585840b32e6014f2540d689b208fa49b583345736f61225f49783fbdd28c995
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains references to 'Oxford english dictionary download pdf' and the malicious URL, suggesting a lure to a fake download page. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to potentially compromised or malicious domains.

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=oxford+english+dictionary+download+pdf
    • http://diropisa.cyclebavaria.com/uploads/1/3/2/6/132696030/jamadafozupawe-validofide-nilolenabenu-sutabujuzebi.pdf
    • http://files.sunriseonlinecourses.com/uploads/1/3/2/7/132740821/depagikarap_bugos_zeburixu_xofas.pdf
    • http://files.ofp.cosmo-ufes.org/uploads/1/3/1/4/131407547/sopamafom_fosegaruzixe_doropivarov_nedipok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2415/files/jquery_checkbox_checked.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/19483695495.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/8191288726.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/5294189606.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/rodiwudawokutedavuvigaxuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/31786235390.pdf
    • https://cdn.shopify.com/s/files/1/0437/7382/1082/files/lebezevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/32079565144.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7879/files/addition_word_problems_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/mezukoxetijadem.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_off000063e5.bin
04f9c413b2e2c553b66353a74a3bdd79e896f57a1724dd81859b32322bd7b0ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 5704 bytes
font_01_sfnt_off0000776e.bin
9c0a29fb7596ff00fd1022b460dab3954635db8ee0a0e16db008f154f564ec33
pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 10468 bytes