Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc6992f422bff46…

MALICIOUS

PDF

49.2 KB Created: 2020-08-14 06:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a3d2cb9b833e4bcb2b11f4f08db43c SHA-1: b5fde40a6ea7c1ab2d2d5b1db0dc688bfe6d7867 SHA-256: 2bc6992f422bff461701093a7c85033444f68b3c8ca88ff0f5c05f8a150e6811
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wb?keyword=lupus%20diagnostico%20diferencial%20pdf. The document body, though heavily obfuscated, also contains this URL and other embedded links, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=lupus%20diagnostico%20diferencial%20pdf
    • http://files.elginparkathletics.com/uploads/1/3/0/8/130873875/491117.pdf
    • http://files.executiveinnoakland.com/uploads/1/3/0/7/130776795/makiremoj-riwovedapoj-zenewib.pdf
    • http://files.integrationresearch.net/uploads/1/3/1/0/131070911/zepiboletilugova.pdf
    • http://files.kozynook.com/uploads/1/3/0/7/130739011/5f0de502d.pdf
    • https://cdn.shopify.com/s/files/1/0440/5752/6437/files/jebek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/58302693725.pdf
    • https://cdn.shopify.com/s/files/1/0435/4126/6587/files/17022744983.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/2155587110.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/kajajafagigavetetod.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/wemizejalogikixino.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/50708921357.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6513/files/kannada_bigg_boss_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/38912601550.pdf
    • https://cdn.shopify.com/s/files/1/0432/2289/2711/files/85119802970.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/runolukowofebugavugawavik.pdf
    • https://cdn.shopify.com/s/files/1/0429/8054/0575/files/11037121521.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_off0000749f.bin
a6574981b1fa14f208f667085473a6c2ed5b2611611177a34dc6ef54704a7237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 5148 bytes
font_01_sfnt_off00008630.bin
f5179c283bd64ed0bc67c681fb113ce6d5f63016a653b1b297b598c6597a619c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8630 10520 bytes
font_02_sfnt_off0000aa05.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA05 4324 bytes

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