Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbeb1cc13438d2da…

MALICIOUS

PDF

48.1 KB Created: 2020-08-31 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df35ab816baecf156fc965861a396788 SHA-1: 04c10a48b569d95fe92d8aa2ee86755278b14891 SHA-256: fbeb1cc13438d2dae3771b3a4006e48e43ece68d89539189d63c26f05ef88d92
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a software download, specifically mentioning 'Adobe reader 9 free download'. This link, `https://ttraff.cc/wix?keyword=adobe+reader+9+free+download+for+windows+7+64+bit+filehippo`, is flagged as a malicious redirector. The document also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm techniques used to improve search engine ranking for malicious content. The ML classifier strongly indicates 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.cc/wix?keyword=adobe+reader+9+free+download+for+windows+7+64+bit+filehippo
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/69690557751.pdf
    • https://cdn.shopify.com/s/files/1/0437/9544/7970/files/21886117290.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/bergey_s_manual_of_determinative_bacteriology_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/chiari_malformation_type_1_death_rate.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/siwatavoj.pdf
    • https://cdn.shopify.com/s/files/1/0457/6237/9940/files/60903708998.pdf
    • https://static.usrfiles.com/ugd/b8c837_df1a1c20865c4c6e9d4104b2398e5560.pdf
    • https://static.usrfiles.com/ugd/278743_61143f018e424f9d81d233e79a118d1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff238bc9a5d74139b1572a6204f549ea.pdf
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/16997917854.pdf
    • https://cdn.shopify.com/s/files/1/0463/3211/7147/files/81046431256.pdf
    • https://cdn.shopify.com/s/files/1/0440/1925/3413/files/49524166731.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/dragon_age_origins_mod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/alien_force_3d_game.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b7.bin
8b46cd88cc7732b81367f536aa444d3b167b7aacd4dc8953eaa0df65f7631343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 5616 bytes
font_01_sfnt_off000077d0.bin
f3bff539cea847c4110fe167a97bd7271a4999c9076d847c81f38089f12c642f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 14500 bytes
font_02_sfnt_off0000a4fc.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FC 4324 bytes

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