Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b89353dd2551c2…

MALICIOUS

PDF

37.6 KB Created: 2020-09-18 08:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d657dcab61345ced2ecf1126cab2662c SHA-1: bc931feecbcd99dfa45d3d19ed1559d570dd0409 SHA-256: f1b89353dd2551c25a8fa84a21fad17af9a3e862bb2cb355369814a7077a434d
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a primary link directing to a malicious redirector. The document body, though heavily obfuscated, contains text related to 'how to mod vpn apk' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link farm or redirection scheme.

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.me/wix?keyword=how+to+mod+vpn+apk
    • http://files.not4cell.com/uploads/1/3/0/8/130874655/vavorupiloje.pdf
    • http://dowewan.behappy-lifetransformation.com/uploads/1/3/1/4/131453041/3068817.pdf
    • http://sidoror.rooseveltelementarypto.org/uploads/1/3/1/4/131407629/daragotajomamux.pdf
    • http://wakok.podantics.com.au/uploads/1/3/2/8/132815094/8574251.pdf
    • http://tiwap.msdgrabs.com/uploads/1/3/2/3/132302870/givoxirovinuwef.pdf
    • http://files.matthewschwartz.org/uploads/1/3/1/4/131483317/bapepomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92283418618.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/38587937350.pdf
    • https://cdn.shopify.com/s/files/1/0459/8146/6791/files/mujujekasisuronapa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4984/2850/files/bhagavan_nityananda.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/bodmas_questions_for_class_6.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_off0000571d.bin
2c460fb9c2503f853281c5b48cef9b94742a9699b1edcd43354be84236b5d4f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571D 4976 bytes
font_01_sfnt_off0000680f.bin
cd4f76895c95d280e0ca1e9f2f7c36e64b4d714e17f4fe2965460a6000c5773e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680F 10044 bytes

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