Malicious PDF — malware analysis report

Static analysis result for SHA-256 1499f61840f89b8f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-03 15:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3833761c9a4eb8d359b03cc8fec3ae3 SHA-1: 2b1bb79bec965f56e7526979506c5d0e5b9872c7 SHA-256: 1499f61840f89b8f27b32338dccb85a268ea400f3fb8f1559c8aefa3c46cf477
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as book downloads. The primary link redirects to `https://ttraff.com/pify?keyword=avik+sarkar+book+pdf+download`, which is identified as a malicious redirector. While no scripts were explicitly extracted, the structure and heuristic firings strongly suggest an attempt to lure users to malicious sites, likely for further exploitation or phishing.

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/pify?keyword=avik+sarkar+book+pdf+download
    • http://files.oatfieldfarmandstables.com/uploads/1/3/0/7/130776111/pibojimevu.pdf
    • http://files.dollbayou.com/uploads/1/3/1/3/131398507/diwofogeluwo.pdf
    • http://files.marktech1.com/uploads/1/3/2/7/132740620/5012904.pdf
    • http://files.cayliemashphotography.com/uploads/1/3/1/6/131607363/dimixibefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/tikakutid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/pulofojisudezufa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7832/files/28591218338.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/39378143474.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/53737044465.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/anet_a8_cura_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/48011967971.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/ginirajasutoruxozobate.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/33227967377.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/89450175042.pdf
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/77074500526.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/41082541789.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004792.bin
edc38f3c1a5381437849a9b8efd943f7f1d0e375f7e0ea67382c5cd7d7152b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4792 5380 bytes
font_01_sfnt_off00005a01.bin
9b6392baa2edb8e8a8b63a677f173a009d7172caccc5e3fb10ee1930f5338462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A01 7940 bytes
font_02_sfnt_off00007279.bin
d761b0954ac8c6f948a93eefbf51c46ff0b0e796e4136a3c47392fd9faeb0e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7279 9252 bytes

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