Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3abc79fdee5e04a…

MALICIOUS

PDF

52.6 KB Created: 2020-08-20 14:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253992fe999a90b13cb0adade032cac2 SHA-1: c0414c50ee6a47db8540291f5be7bbf780a0ec79 SHA-256: f3abc79fdee5e04a7058ac1f17d7c276ae37800f1d7e192a450024342eb3b75e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the primary goal is to redirect the user to a malicious site, likely for further exploitation or phishing.

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=molar+volume+of+gas+lab+answers
    • http://files.christiangreenlmt.com/uploads/1/3/0/7/130738969/6021513.pdf
    • http://files.giaddiecreations.com/uploads/1/3/2/7/132712326/9694830.pdf
    • http://files.spiritualself-inquiry.com/uploads/1/3/1/4/131438427/6247053.pdf
    • http://diwozoxef.ivexpo.com/uploads/1/3/2/7/132710589/2100133.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/playboy_magazines_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/cycle_country_plow_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2981/files/90329828806.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/nupirarakir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/brain_teasers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/kabary_betsileo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/84092837972.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/android_10_xiaomi_a2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/the_disappearance_of_hatsune_miku_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/accessible_tables_in.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_off000068d7.bin
64208f202a69d33551b99ac3c7f8366963ee5f60b80fe6f59d41735b3e779fac
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D7 5384 bytes
font_01_sfnt_off00007b35.bin
d30dee97d771645bdb6df6d476bb1a116fe8ec7b89447c4bc89531751b7f42eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B35 17036 bytes
font_02_sfnt_off0000b027.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 16204 bytes