Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7e3122ecccb2e0…

MALICIOUS

PDF

44.4 KB Created: 2020-07-30 04:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff1c6f863f00afd2cf76665d290dfce SHA-1: de5b963c57496287b1e9e881ffd5ba4c74e40efa SHA-256: ec7e3122ecccb2e00448126286de5d0be579a0d209f6304952276c182f84a82c
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to known malicious redirector infrastructure (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of a link farm suggests an attempt to lure users to external, potentially harmful, sites.

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.com/pify?keyword=feathered+dinosaurs+the+origin+of+birds+pdf
    • http://files.southcliffcommunitygroup.com/uploads/1/3/1/4/131483386/1079273.pdf
    • http://files.garethworthington.com/uploads/1/3/2/8/132814097/49401c4b.pdf
    • http://files.petesmentalhealthtravel.com/uploads/1/3/1/4/131406506/a1329bb5065.pdf
    • http://files.regenbiopharmainc.com/uploads/1/3/1/3/131398360/kizorasapesavu-pegurepijejano-rigut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/8451077206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/31752343116.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/95815525306.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/7607947038.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/xetuwudupumadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/tubadivuxukeri.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/rawigokif.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/zabimixejijefenixumizok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/72512212171.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/89746365563.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/jazukizojimamijawimosev.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/jefiguvarijud.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/2762592243.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_off00006f8f.bin
52eb22f66058ed207f6b95b88abb55c5b18d1d15b36e25b85c34a1656b2a7e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 5248 bytes
font_01_sfnt_off0000815c.bin
37f79a20e9dd4c1d6346eb39ceccfa318b71bc95f6185d2f1f0ab794e64eda93
pdf-font-stream PDF embedded font (sfnt) at offset 0x815C 10180 bytes