Malicious PDF — malware analysis report

Static analysis result for SHA-256 818bb044abe95b0c…

MALICIOUS

PDF

44.4 KB Created: 2020-08-24 08:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d3845dd5d8241230c31a4e27229c5f SHA-1: 19487775eabdb8310c8cb488fdee506c2b779400 SHA-256: 818bb044abe95b0c3a192372af01db2026d79245e789c702e904a52af3ff08a7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=convertir+de+pdf+a+word+en+mac'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content.

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=convertir+de+pdf+a+word+en+mac
    • http://files.paintedskyalpacafarm.com/uploads/1/3/1/6/131606965/woxodojuneb_tasaxenarom_merex_rifarobulaz.pdf
    • http://files.reconmetal.com/uploads/1/3/1/4/131406082/zovuderas_xowimal_laxetenedavav.pdf
    • http://pipoda.yogawithanniebarrett.com/uploads/1/3/1/0/131070197/jarusalaxovoseg_wejobege.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/92657109886.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3184/files/too_legit_to_quit_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/angara_movie_all_song.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/free_mcx_technical_analysis_software.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/mufaxenufomelapevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/29207732827.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/13836452057.pdf
    • https://cdn.shopify.com/s/files/1/0452/5296/8609/files/declare_variable_in_template_angular_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/95832611912.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/vusopizowetexuxokosazose.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/dejafomowoledokeperad.pdf
    • https://cdn.shopify.com/s/files/1/0445/6048/2463/files/an_introduction_to_cardiovascular_physiology_5e.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/45535349894.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_off00006bad.bin
035d11c1296dee1100f59f6b1e6cb5a1c65dbf3cbfdfc9d9aabd2ccf181f8810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAD 5148 bytes
font_01_sfnt_off00007d2d.bin
25b82d30e361b230f7fcdcf9fd028c279828ab5432b4015144d8dee36518e7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2D 12000 bytes

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