Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4e91dd8a019d91…

MALICIOUS

PDF

51.7 KB Created: 2020-08-17 12:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f394d756c29d754400621e5322d304ea SHA-1: 536085cd1f316e503bde73a256b4344ba00421f2 SHA-256: 7a4e91dd8a019d9126f8ab5f3d303fb020caf41cf26a1cffac47d08f9258572c
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=template+for+discontinuation+of+services'. Another critical heuristic identified a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0429/8381/7375/files/puwuwijobifopelemoxumutog.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=template+for+discontinuation+of+services
    • http://nadas.learningpgh.org/uploads/1/3/1/8/131872096/080b7718a1c3.pdf
    • http://files.alternativefruit.com/uploads/1/3/1/3/131379709/wakuvejoraderuv-tubafolemi-metapibefudi-vuliriledukuzu.pdf
    • http://files.chrismayne.ca/uploads/1/3/1/4/131483200/wunuladar_kikagemokerasij_konuv.pdf
    • http://files.tricitywv.com/uploads/1/3/1/1/131164009/xujazagajovadusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/puwuwijobifopelemoxumutog.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/49372302109.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/bapozetukapowodamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/15590423952.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/payback_2_apk_son_srm_indir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/98881482373.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/email_writing_examples_informal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/48095385344.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/74837128762.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/74550370898.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7160/files/bruno_munari_design_e_comunicazione_visiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6695/files/re_art_e_i_cavalieri_della_tavola_rotonda_libro.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_off000082ad.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AD 2828 bytes
font_01_sfnt_off00008ca8.bin
d68f158543fcf280db2a9d9834c193471a1524f0a27f7ad959d6bf5069c3e19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA8 5312 bytes
font_02_sfnt_off00009ea3.bin
1a8327eb6c921ec561d2a358f08a4384d0ffb895f17417cc7bcb678939eb1ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA3 10204 bytes

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