Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845e5a368f9c511…

MALICIOUS

PDF

36.4 KB Created: 2020-08-22 22:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e13e3e237b0250bd085fb3aeb41944a3 SHA-1: ebfd42b9f010e4e9eff07f8d12f6f8c28c717ff4 SHA-256: a845e5a368f9c51138dcaf73f525c6e745b9d1dfb837a99fe14a5f7172acd106
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to 'comic template' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of exploit or malicious content delivery.

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.com/pify?keyword=comic+template+ks2
    • http://jefarekik.copyslutband.com/uploads/1/3/1/3/131398101/fejunaj_nodosozeva_gaxup_vakabaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/xujejezewirumigaxejoruto.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/76591025353.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/marsupialization_of_bartholin_cyst.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/12714021231.pdf
    • https://cdn.shopify.com/s/files/1/0435/6630/1343/files/nejix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/nirizisufa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4206/8887/files/anime_movies_that_make_you_cry.pdf
    • https://cdn.shopify.com/s/files/1/0436/9694/7353/files/datux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/machines_like_me.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/kipimosugedijowuke.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_off0000516f.bin
c228a2344c52e6c0094699b5b252dd7eb1a92525b557d85d10b2346dfbba16d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x516F 5084 bytes
font_01_sfnt_off000062a4.bin
49944f091a04c69f2d51ff7bd5d10d129acdc2f91c9f80d8b63f18407eee5cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 10148 bytes

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