Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b39df84927d80d…

MALICIOUS

PDF

45.9 KB Created: 2020-09-14 09:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de2d8f13fc1eb166b8c5aa32fb710f6 SHA-1: 321800b0635c5159826bb4704dc5a2a84833ed84 SHA-256: 22b39df84927d80df383701211628054d0226681a69be1962cbb7bbc895b418b
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, pointing to a URL designed to redirect users based on a search keyword. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm or distribution network. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links and the link farm structure strongly suggest a phishing or malware distribution attempt.

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=idylis+portable+air+conditioner+manual
    • http://files.sarasotarockers.com/uploads/1/3/1/0/131070872/1a9430c.pdf
    • http://javifamu.purefaithministries.com/uploads/1/3/1/0/131070450/3f463f52b25f.pdf
    • http://kijiji.nigelbeebe.com/uploads/1/3/2/6/132681790/10d33db27.pdf
    • http://mawafa.richlandareafarmersmarket.org/uploads/1/3/1/4/131437299/jikexiwesujixus_nazat_nuneda.pdf
    • http://files.impunity.site/uploads/1/3/2/6/132681204/lefopogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/79642055007.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/moran_s_i_spatial_autocorrelation.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0151/files/captain_marvel_hd_movie_free_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/fitted_bed_sheet_sizes_uk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/80745222236.pdf
    • https://cdn.shopify.com/s/files/1/0468/0318/9911/files/25103156461.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/3555568250.pdf
    • https://static.usrfiles.com/ugd/ee6770_2c52c2cfb42f4f67b183cbbcf4931c96.pdf
    • https://static.usrfiles.com/ugd/2813e2_2e42f3ddd6174769ab09738adba6d8ec.pdf
    • https://static.usrfiles.com/ugd/ff2e72_fbe77a224be84390a4af480b1c8d6553.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_off00007532.bin
a839727b70379ba9f1ee82cf0a71c0056a14214bc1742689556c131d039c0db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7532 5400 bytes
font_01_sfnt_off00008778.bin
9f42a773b5193c18f3275c88e3659f083d73510be91609f8e34110796b517fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8778 10272 bytes

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