Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7e2a4f81a9e993…

MALICIOUS

PDF

54.7 KB Created: 2020-08-06 11:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085fd6f14d6e92ee2aae70fdead5ae13 SHA-1: dcc600f2e7bb8db80d98de255ed422e3b1780acd SHA-256: 4f7e2a4f81a9e9938fc125772c487fcf0db4261fc0d0f8e533d22dcf6bd75d47
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier 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.ru/pify?keyword=boy+erased+em+pdf
    • http://files.michelamclaurin.com/uploads/1/3/0/7/130740563/4377520.pdf
    • http://files.cost-of-health-carenews.com/uploads/1/3/0/7/130776016/kesudad_bekudut_laviwasadujolu.pdf
    • http://files.streetsvillechristmasinthevillage.com/uploads/1/3/1/4/131437655/5456b.pdf
    • http://bujibi.marianafuentes.net/uploads/1/3/2/7/132740405/9355161.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/rowubegukisufubovupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/bifedavagiwozigiwizeze.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/15667442387.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/xamim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/70102451053.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/35000516867.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/4936282483.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/sevoba.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/95028462703.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/45500576453.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/rumobovuwukosugewalisex.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/69038133435.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/citation_machine_fors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008972.bin
728b1845d66b3b636ac28dae81c6fd12eb03dc077970d6523bf9ce2b5446025f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8972 4860 bytes
font_01_sfnt_off000099f4.bin
f494e229fb7bf2afa1ca2319e74d3a958bd16d7bcdac010e674b2bd47f9a875a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F4 11240 bytes
font_02_sfnt_off0000bf82.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 4324 bytes

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