Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc950c633cf5436…

MALICIOUS

PDF

58.3 KB Created: 2020-08-28 07:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31963c673c57fa67bfd90b05725e33a9 SHA-1: 196b26ce3a448b39327ae211494fa02d2bb00d26 SHA-256: efc950c633cf54360c97ede3fc70b7c48830524d1d3f88ce23a6ed6b7456cd9c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=legacy+of+discord+enchant'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=legacy+of+discord+enchant
    • http://files.esainhospitality.com/uploads/1/3/1/3/131398195/gomuniw_ratalam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/diwefe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/lufunuderar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/adeste_fideles_noten_orgel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4573/files/lebamivoronofivem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/34079228770.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/facebook_android_mobile_app.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/rowitati.pdf
    • https://cdn.shopify.com/s/files/1/0461/1692/9700/files/57850212476.pdf
    • https://cdn.shopify.com/s/files/1/0436/1197/9939/files/bafg_berlin_formblatt_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/zafujagezuboburu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/ponatufaxitijojuluwagi.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_off0000a608.bin
80afab431a34e39abbf5230642a6fe4bd567890ab0b75268967dedd9a1b2dc2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA608 5292 bytes
font_01_sfnt_off0000b805.bin
f56a348875d6cc331b5f420b576324701e1d315b69740d6ee361cd262f1371c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB805 10604 bytes