Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4199585baef1eb1…

MALICIOUS

PDF

56.2 KB Created: 2020-08-09 22:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2237e4bd92dc375430613cd5249eb6c8 SHA-1: 185a76e02f7d4695eb216b355617dfec5aea02df SHA-256: b4199585baef1eb1a95912f764897dc87f21abc06333ebb8e5fe2adff12c35df
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a PDF link farm designed for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=english+to+arabic+basic+words+pdf'. The document body, though heavily obfuscated, also contains this URL. No scripts were extracted from this sample.

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=english+to+arabic+basic+words+pdf
    • http://files.kerry-bike-usa.com/uploads/1/3/1/1/131164313/seliwojoj-wutateposetisib.pdf
    • http://vagisap.qldenergyexhibitioncentre.com/uploads/1/3/1/4/131453177/1561830.pdf
    • http://files.middletownbaptistchurchmo.com/uploads/1/3/0/7/130739312/4122267.pdf
    • http://files.stellashaw.com/uploads/1/3/1/4/131437669/tibukugumop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/gagimasakuwipivafenufinek.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/31946382439.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/28403566608.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/49749493645.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6370/files/rukozumezosab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/under_the_radar_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/49170721297.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/16968655780.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1699/files/12274707444.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/tosuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/valpakine_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/kawekezukisari.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
stream_005_off0000a4fb.bin
950fed63cf5319a28e9245ef45cac55ded45109d68a452a923e294608e6aee89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA4FB 25864 bytes
font_00_sfnt_off00006b08.bin
6fd817132e82b21041f07e63fa299ecc943b50b2ddbefeea6235e3d79a9a10f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B08 5608 bytes
font_01_sfnt_off00007e28.bin
d38cb9d98b7776a8e43473ae952143238ceb9c2f07139f83230d2047eacfb5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 12404 bytes

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