Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff05cf7aeefbdc9…

MALICIOUS

PDF

35.5 KB Created: 2020-08-06 19:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da950a857ddb11be6ac73ec67d0e43cf SHA-1: d9f3d3124ffd521ada3dfeaf7d8482bd21b6229e SHA-256: aff05cf7aeefbdc92c4c1b19ab8a3d50453757d7d7d6089cdce4be84c94cb03b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the link farm. The primary malicious URL is https://ttraff.ru/pify?keyword=pembebanan+cantilever+adalah+pdf, which is likely used to redirect users to malicious content. The presence of numerous Shopify-hosted PDF links suggests an attempt at SEO poisoning or a large-scale phishing 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.ru/pify?keyword=pembebanan+cantilever+adalah+pdf
    • http://files.californiaketo.com/uploads/1/3/1/8/131871621/ff7b1953.pdf
    • http://files.timeoutsportsbarandgrill.net/uploads/1/3/0/8/130874559/2773666.pdf
    • http://files.ustbonifacefafs.com/uploads/1/3/1/8/131871864/919049faa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4981/files/jeligiwigutojatafodisora.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/dobamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8189/1989/files/2741947046.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/difinebasigesosekimix.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/pasupizezeladom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/1806752581.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/49511587595.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/powilosavirij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/53744068766.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/fiwerewuwodovulon.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/best_friend_s_brother_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/navobixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/94279195886.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_off00004e8d.bin
a2857f4554350712d158ce7a00e6f7d27589c0a4d7378167533cefed9b28b48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8D 5416 bytes
font_01_sfnt_off000060cc.bin
01ab0dc9e17ba208fea326551cf9bd124545cb7d3336fb0e09f3e72e18addad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CC 9460 bytes

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