Malicious PDF — malware analysis report

Static analysis result for SHA-256 088edab71acfa772…

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 01:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52a4cd56c0141bd5a6eca732d9d7388 SHA-1: a1ad575ccf9fdad025fcbc11e28f353f7f828946 SHA-256: 088edab71acfa772985978ef48704eb585b58ae7f3e41aca1812e447ba7e60fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=jumbled+sentences+worksheet+grade+7', is flagged as a known malicious redirector. This suggests the document is designed to lure users to malicious sites, likely as part of a phishing or malware distribution campaign. The ML classifier also strongly indicated 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.ru/pify?keyword=jumbled+sentences+worksheet+grade+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/binuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/reasonable_faith_christian_truth_and_apologetics.pdf
    • https://cdn.shopify.com/s/files/1/0438/4459/9958/files/rs3_summoning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/julipidazupofepadewumel.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/8159862738.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/7065332357.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46283819311.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/batman_villain_joker_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_965d4ac1c6cf4d2bb972178a5b4a47c2.pdf
    • https://static.usrfiles.com/ugd/66c878_e843e39a844e437ca409f33f7619d80a.pdf
    • https://static.usrfiles.com/ugd/defcb2_cf9a3ccb3b1240fd867b7eb4bcfc23b7.pdf
    • https://static.usrfiles.com/ugd/ee4a13_b0c9b4084975417eb74deedc35edc0ff.pdf
    • https://static.usrfiles.com/ugd/0d002d_2345f36ea3224ad68647eb8edff9e54a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c0238f118ca4d269845d0bdfe52e7ee.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006853.bin
b671ef3fd922958cd48de58f0b1430c37080a32716937996b73a771ed071230d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6853 5716 bytes
font_01_sfnt_off00007ba8.bin
831ed3a96ba9e3fc9c2cf23de51867e98c1089f2ee148b359f28e9e227d4f121
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA8 12900 bytes