Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c8ea8964a0d80…

MALICIOUS

PDF

96.4 KB Created: 2020-08-15 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 246927c4b166a98df23b232713276164 SHA-1: f3dbbe7fa101783912a8b565a5ba8186669ba4db SHA-256: 852c8ea8964a0d8043f69fd2f9095c205fe8c9ee5bd8bf6b7552a5cca2a13baf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to deliver further malicious content. The document body, though heavily obfuscated, contains text related to 'Google ads search certification answers', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

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=google+ads+search+certification+answers+november+2019
    • http://files.mymobilis.com/uploads/1/3/0/9/130969424/38eae83f4179c28.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/35274313467.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/intermediate_accounting_12th_canadian_edition_volume_1_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0513/1421/files/gujakagigopowefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/2009_honda_accord_maintenance_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/flower_lenny_face.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/vuxinikufekamopukojilo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/winukuliwor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/nuzomuv.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/81775102483.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/92261188253.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/rapapat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/baby_shark_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/buchi_emecheta_the_new_tribe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/atlantic_ocean_facts.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/baxokitoref.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_off00012cc1.bin
ff6e225305808c55b7d60db2565156666a20496168233a72e5fbd803ff3834ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 6028 bytes
font_01_sfnt_off00014135.bin
ffc4db578a9f7dcdcea431d4c9d360dfb130affc1374eb4aa4d3dc7609e0a695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14135 10524 bytes
font_02_sfnt_off00016549.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16549 4324 bytes

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