Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0fc69e1df55315…

MALICIOUS

PDF

39.7 KB Created: 2020-08-07 18:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f18639df6778a8c19f1d70805da37a15 SHA-1: b43ecc739c1fe9e9a3c68fded334cb30c03a95d8 SHA-256: cc0fc69e1df55315bf4fd6a570f2a69a0f9d6e0430bf98e1f38395199a82f31c
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, many pointing to Shopify domains, suggesting an attempt at SEO manipulation or a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=bihar+map+pdf+download. The ML classifier strongly supports the malicious nature of this PDF. 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=bihar+map+pdf+download
    • http://files.seasidehomedesign.com/uploads/1/3/2/6/132683357/pobaxibikupegakesav.pdf
    • http://files.adenrossinni.com/uploads/1/3/2/7/132711966/4513352.pdf
    • http://files.isaacchandesign.com/uploads/1/3/1/4/131483423/xeguz-xobebe-manirejev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/kegebusuzidutelurefusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/joseph_ratzinger_introduction_to_christianity.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/72489026857.pdf
    • https://cdn.shopify.com/s/files/1/0437/7283/8039/files/fofomugosexetafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/376213292.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5578/files/89084718078.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/dawenivolulovupovusil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/kinukemimivikoroni.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/wigagabonogepozerod.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/fitbit_charge_2_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/dinakuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/miwebotego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerivavegexem.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_off00004edd.bin
a29ebc2d789c2b8c4ab7755a1ab158101f5ab68c23d99f8d1d7cacfc8bd4fadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDD 4832 bytes
font_01_sfnt_off00005f20.bin
b65d9a948a54891343c12dd2e574c54a370f3146874f0be9bcd4c677fe4b6366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 10336 bytes
font_02_sfnt_off00008265.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 4324 bytes

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