Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edb115934804afc…

MALICIOUS

PDF

39.9 KB Created: 2020-08-23 20:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b642d620226936c5d25bd17a796d984d SHA-1: 36613dcb0e3996fa647634354cf455014d214cd8 SHA-256: 0edb115934804afc9561345070e34e1b415a93f179e95a0e6a6a65702388030d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the text 'adverbs worksheet 5th grade pdf' and the malicious URL, indicating a lure to disguise the malicious intent.

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=adverbs+worksheet+5th+grade+pdf
    • http://files.cowboygearbyhayroot.com/uploads/1/3/1/0/131070911/renakazujere_bedubepaf_dofeberozigav_pizaratuw.pdf
    • http://files.lucidartgallery.co/uploads/1/3/2/8/132814505/6113010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/purpose_driven_life_day_40.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/meziduseboresuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/weruwix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/sijukelawor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/18839535484.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/building_information_modeling_master_s_degree.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/folazugumawavazaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/18722033660.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/dogaxubokaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/78276269039.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/38008564743.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/aradhana_new_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/fisilevolojegalur.pdf
    • https://cdn.shopify.com/s/files/1/0434/2366/2236/files/algebraic_topology_allen_hatcher.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_off00005cfc.bin
557f0b5b42065931907f4aaaea1fb6bc832cf880bbfb88bc8ef7093037320613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFC 5740 bytes
font_01_sfnt_off0000709b.bin
bfde6ac420e8c686731822974afb317b94985c0ab429dc27e9263f504c79f209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 10072 bytes

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