Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbcfbeec79923c1…

MALICIOUS

PDF

56.0 KB Created: 2020-08-17 17:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6a5a17e072a6a4d4a4482637f19a33 SHA-1: 918c71dcc235ff3ecf9b548ee6cd28f71420b49d SHA-256: 0bbcfbeec79923c1e2d4ad7a1c81c4da5d54d664db84f7559ecd743e7f9ff2d7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, likely as part of a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains a URL that matches the primary malicious redirector. The presence of numerous external PDF links further suggests a link farm or spamming 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.ru/pify?keyword=artritis+reumatoide+juvenil+en+ni%25C3%25B1os+pdf
    • http://jumate.484sign.com/uploads/1/3/2/7/132711949/d4011950271f0c5.pdf
    • http://kewubu.parchmentvalley.org/uploads/1/3/1/0/131070302/65994.pdf
    • http://files.amasamasonlyman.com/uploads/1/3/1/6/131636584/e29a24d82c21a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/mastering_chemistry_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/3311/5289/files/74545852424.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/dobuve.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/fusaxafajemotuwosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/quantification_theory_in_logic.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/the_mysteries_of_laura_cast.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/43647749936.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/morosumavumasodenoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/37674849555.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/types_of_autism_spectrum_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/california_collections_grade_7_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c61.bin
d084b7deb3e711dbf8665dffbb33f86994c97b59ac7f8102795d6ebd7eb2564b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C61 5408 bytes
font_01_sfnt_off00009e6e.bin
dbef777d06c77cd3450a2075d6aaa7ca0ca8e4f3b5f6f1f939f1c24fae862a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6E 11056 bytes
font_02_sfnt_off0000c273.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 4324 bytes

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