Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a87cd17757ead5c…

MALICIOUS

PDF

58.7 KB Created: 2020-08-08 12:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936d719ab8f8b37abb6516b241353b83 SHA-1: b2cdb4f97afaa8ddadafdd790f742b9ea7af25ff SHA-256: 6a87cd17757ead5cdae4ea2c6fb692e326ff817f2501a1eca6a8a79ea4659f78
194 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a redirector link and an advance-fee scam lure. The document body contains a URL that points to a known malicious redirector, which is likely intended to lead the user to a phishing or scam page. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.ru/pify?keyword=livro+catecismo+pdf
    • http://files.filteredlifephotography.com/uploads/1/3/0/7/130739549/rebizivav_pulodi_wumitobem.pdf
    • http://files.one-world-sales.com/uploads/1/3/2/6/132695258/keditojemola.pdf
    • http://files.msbes.com/uploads/1/3/0/8/130815115/141045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/75631157708.pdf
    • https://cdn.shopify.com/s/files/1/0440/6948/6757/files/11229912596.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/nezilulebevufukow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/78531008586.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/defejelunelelupenumubawil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/wurafavepupojikemev.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/12152209323.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/95464027383.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/ssb_stenographer_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/56193457254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/83232297708.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/93971278972.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_off0000a2c4.bin
3492eaa407d5bebb220647469b907eeb05d3fc835c020144cf47658f7711349c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C4 5268 bytes
font_01_sfnt_off0000b4a5.bin
a632d3fa1486f9fa0aff1585b23513d3243076a9b9da43f3ee99948559b0a32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 12572 bytes

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