Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd35b0ce7a4236…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 08:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d7e4d990f68b96de6c35745f562c23 SHA-1: 6a214ce79a110254daba0bdf44e2308ee9a6e627 SHA-256: 63dd35b0ce7a4236c66958f05a8671dde0878d7f09f6e138faf9526c144dbbcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files, with the primary link leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to funnel users through a series of links, likely to a malicious site or download. No scripts were extracted, and the document body was heavily obfuscated.

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/wix?keyword=mache+becif+letra+espanhol
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3978/4103/files/zobojifokaredovel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/lujafagebiminupejele.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/zadikekajupekagasixizum.pdf
    • https://static.usrfiles.com/ugd/b77b08_0d3f3e39a64b43048641198e7a9a55f3.pdf
    • https://cdn.shopify.com/s/files/1/0460/1652/8551/files/dadaganiganupuduwogin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/70551559202.pdf
    • https://cdn.shopify.com/s/files/1/0433/0582/8520/files/20352157381.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/70532759476.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/automotive_spice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/9811/9075/files/jelitawono.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/30225898390.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/basic_questions_of_civil_engineering.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_off0000646c.bin
f43b704f80067c4dd0457b923cfef76a3a10c7c450becb83184a6fbe7dacf5db
pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 5036 bytes
font_01_sfnt_off00007570.bin
957cb327d6e0ffa97840e1c8ff7f39621c464e25b7a8a5c663ebde0d4b1fbe4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 13416 bytes
font_02_sfnt_off00009ff0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF0 4324 bytes