Malicious PDF — malware analysis report

Static analysis result for SHA-256 741559a842557090…

MALICIOUS

PDF

35.4 KB Created: 2020-09-10 02:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b987e6a86323e60b8a918feda41c7932 SHA-1: daf9f364a741b385bc578b887420853b5bc1d6a9 SHA-256: 741559a842557090a7d471ce1a00ece067930c82fb32da8b0cadef54b1fb0ff8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the same malicious URL and references to other PDFs, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=recognising+tenths+and+hundredths+worksheets
    • http://fugoj.reading-is-lit.com/uploads/1/3/1/4/131452954/fuzawirebuj-xuvuti-mosomemeneliv.pdf
    • http://files.chrysalisearthfarm.org/uploads/1/3/2/6/132681660/vutofela.pdf
    • http://files.my-elliott.com/uploads/1/3/1/3/131380511/turivuxumumu-rubekasez.pdf
    • http://watug.leilanisalon.com/uploads/1/3/0/7/130738801/7317663.pdf
    • http://files.theredladybugdesign.com/uploads/1/3/0/7/130740249/1108477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/toyota_auris_2020_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/tft_item_builds_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/28556687231.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/nalul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/arpegios_para_guitarra_clasica.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/central_pneumatic_3_gallon_air_compressor_manual.pdf
    • https://static.usrfiles.com/ugd/e1a791_f7df3d9619274e0d957310cf61b727f6.pdf
    • https://static.usrfiles.com/ugd/4ae4db_be326516a19b4fcfa39c0756d8f5847c.pdf
    • https://static.usrfiles.com/ugd/3eb4bd_e2c5d1de5f0446f988f4ecda36ac7599.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c7b.bin
660ce1e2be43313ef76472a9fbe063b0d2345e3082e85e7c1bb00caad1658609
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7B 5332 bytes
font_01_sfnt_off00005eae.bin
048ca025d23ef0967d00e1db3556d466730339d46f9be66855b172ddfd365523
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 9960 bytes