Malicious PDF — malware analysis report

Static analysis result for SHA-256 97964f202ef3b6e3…

MALICIOUS

PDF

41.7 KB Created: 2020-08-09 01:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3ab80e1837bb256baa50a5a5300272 SHA-1: 44d93d8d7e46eaf717b17e272f5eaa3ddfa7bcb6 SHA-256: 97964f202ef3b6e3d7d595c9e55cf7712db1f0eb5a0c3895f23aec459853e5a7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though partially corrupted, contains URLs that appear to be part of a link farm designed to attract users searching for specific technical guides. The ML classifier strongly indicates malicious intent, likely to redirect users to sites hosting further malicious content.

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=aws+command+line+interface+user+guide+pdf
    • http://vedoxogi.sparkysplace13.com/uploads/1/3/2/6/132695569/newixoni.pdf
    • http://files.av-imagineer.co.uk/uploads/1/3/0/8/130813511/nukum.pdf
    • http://gojavojur.barrydelivery.com/uploads/1/3/1/4/131453247/99f1c3b2dabec.pdf
    • http://files.resopstrategies.com/uploads/1/3/0/8/130873875/8885345.pdf
    • http://files.3531developments.com/uploads/1/3/1/6/131606206/d51e8202.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/jejodapirugepotip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/tofunuwumezejikukigax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7549/3271/files/61312797009.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9733/files/duguxunaxosibotesimibu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/67968754901.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/useful_unix_commands.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/22576426279.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/53583501846.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3655/files/87161985204.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/pezaraz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/40963783381.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/for_dummies_collection_free_download.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_off00006347.bin
cf6b21261fd7263ffb2d95d5de7f953f375ef8c3d755c7e92db54671b38abd1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 5556 bytes
font_01_sfnt_off0000762b.bin
97ec0b06dd8a0cfa0bc69a4451401432102e534ad8908e04c86df3bcf8c9e70e
pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 10420 bytes