Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb438be541dbb75…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 19:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b83bd86ba9cbc3dc21e2b36f13d835 SHA-1: 50e716607835693d4d59fc1d9a51523342977e4e SHA-256: bdb438be541dbb75c8ff762529e08861bd711527da148d0ebbc1fe8294d0d50b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'root checker apk latest version' and the malicious redirector URL, suggesting a lure to download potentially malicious software. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=root+checker+apk++latest+version
    • http://files.sincerelysharry.com/uploads/1/3/1/3/131379894/rusinuwireze-gogesesazis.pdf
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/detaledukejepobizeniv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/magopudogifixigekogexuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/scipy_confidence_interval.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/88209542694.pdf
    • https://cdn.shopify.com/s/files/1/0455/4712/6949/files/tom_and_jerry_hired_goons_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/75238598064.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/73237390936.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/58463109795.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/fozugosuxum.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_off0000625e.bin
14b9334f6e66d0ccd8167befd5d513c83f74661fa2ef12d753ac8aceb5c66ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 5152 bytes
font_01_sfnt_off000073da.bin
2aaea0b1bdd8f79c0fd743ea5d52c659340aa77430e088888e754a226489eb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 13036 bytes

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