Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be7520463cdd2dc…

MALICIOUS

PDF

37.7 KB Created: 2020-08-18 22:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aa06ff464aa59e1f3b870c52a414620 SHA-1: b96ccb2d784ebc35e0773e489994bef7cbc976eb SHA-256: 5be7520463cdd2dcfb750913ead93a3302003a46d4951db693891dc5288fcfcc
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, some of which point to known malicious redirectors. The document body contains obfuscated text and embedded URLs, suggesting an attempt to manipulate search engine rankings or redirect users to harmful sites. No scripts were extracted, but the presence of numerous links indicates a likely phishing or SEO-spam campaign.

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.cc/pify?keyword=rust+sheet+metal+scraps
    • http://files.immigrationbenchmarking.org/uploads/1/3/1/4/131407299/kamag.pdf
    • http://files.villagescommunity.com/uploads/1/3/1/4/131407226/4927010.pdf
    • http://xivawi.san-vito.co.uk/uploads/1/3/1/4/131437736/febobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/git_add_all.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/86699386619.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/gonodiwubibijebiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/77573576773.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/shakira_waka_waka_audio.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/55223413516.pdf
    • https://cdn.shopify.com/s/files/1/0436/2017/1936/files/aatagallu_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/7906768099.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/61494423045.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/lezavisem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/17475745356.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_off00005661.bin
4d562d35794c3ddcf729ea7c914f986dbf406723de5e8b3da6cf382207df0f3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5661 5180 bytes
font_01_sfnt_off000067d5.bin
bbd7cf0f776d9b66ceb79723dbb72c65c1d6c01ca9e5f0bcfb1d2f68a0941975
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 10052 bytes