Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bc9a0ae9d8eee9…

MALICIOUS

PDF

39.3 KB Created: 2020-09-06 15:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c0607fec6ad83d59cd3e81e1289ce32 SHA-1: df4df879d06cae2599e0bca6852a17ddbc0c3cfd SHA-256: 76bc9a0ae9d8eee98c2925bd9d88f86bae2a4b4eb70402e1a4ad959055850007
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct the user to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links further supports a malicious intent, likely for phishing or malware distribution.

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.me/pify?keyword=big+sean+overtime+instrumental
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/185811_8da1954d17bd4134a9915717e1babf5e.pdf
    • https://static.usrfiles.com/ugd/c3f88d_83f329941b2648ba944394d3f2529148.pdf
    • https://static.usrfiles.com/ugd/e2a635_0fb28dead88b4762873c65ed06ac3567.pdf
    • https://static.usrfiles.com/ugd/762c1a_7bbecd4bd99a48b580267dfc40b833a7.pdf
    • https://static.usrfiles.com/ugd/2b25b5_cf41f3b60ed040f0bf1c9a5d2794ecbe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/bonding_in_electron_deficient_molecules.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/fegubuvazaxawupemis.pdf
    • https://cdn.shopify.com/s/files/1/0457/8014/0188/files/almidon_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/72234077929.pdf
    • https://cdn.shopify.com/s/files/1/0435/5814/2120/files/methanol_water_distillation_column_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/poroku.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/40223264771.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/letabit.pdf
    • https://static.usrfiles.com/ugd/97aff7_6569186ae2cd4578b73129f8f9a7eae9.pdf
    • https://static.usrfiles.com/ugd/c20ea7_6491380f4e9a4d4d8ff75e67a1acbdbb.pdf
    • https://static.usrfiles.com/ugd/b4609a_1b2b475b64004d02b43c07fa00e7111a.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_off00005a8e.bin
5da42fb3898a38ed7877ee6645a8f229032aefd75e08d4a0f458deabec5d3c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 5112 bytes
font_01_sfnt_off00006bed.bin
e8ffc21fa0627833a6539a8f1a41a8a32ce80f2e17541135b38a3336635616b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 10676 bytes

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